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Posted: 11/3/2009 1:22:12 PM EST
4. The sales price of a car is $12,590, which is 20% off the original price. What is the original price?

A. $14,310.40
B. $14,990.90
C. $15,290.70
D. $15,737.50
E. $16,935.80
Link Posted: 11/3/2009 1:23:38 PM EST
The answer is D.
$15,737.50
Link Posted: 11/3/2009 1:23:43 PM EST
The current price is 80% of the original price. So:

Current price divided by 80 = 1% of the original price. Multiply that by 100.
Link Posted: 11/3/2009 1:24:01 PM EST
[Last Edit: 11/3/2009 1:47:38 PM EST by m4sarecool]
1.2 times the sale price. dang

Yeah, fail :Been a long day

.8P=sale price
Link Posted: 11/3/2009 1:24:57 PM EST
Let's make variable P = original Price

P x .8 = $12,590

P = $15,737.50
Link Posted: 11/3/2009 1:25:00 PM EST
Divide 12590 by four and you get 3147.5

Add the two together and you get $15737.50
Link Posted: 11/3/2009 1:25:03 PM EST
Originally Posted By m4sarecool:
1.2 times the sale price. dang


Fail.
Go back to school.
Link Posted: 11/3/2009 1:25:35 PM EST

Originally Posted By paul_the_welder:
4. The sales price of a car is $12,590, which is 20% off the original price. What is the original price?

A. $14,310.40
B. $14,990.90
C. $15,290.70
D. $15,737.50
E. $16,935.80

Lots of ways of explaining this but here is how I would do it:

Original price is 100%

Sales price is 20% off = 80%

$12,590 = 80% of original price

$12,590 / 80% = original price

$15,737.50 = original price
Link Posted: 11/3/2009 1:25:45 PM EST
[Last Edit: 11/3/2009 1:26:19 PM EST by hcook]
double tap...
Link Posted: 11/3/2009 1:26:22 PM EST
Originally Posted By hcook:
Let's make variable P = original Price

P x .8 = $12,590

P = $15,737.50


This.
Link Posted: 11/3/2009 1:27:54 PM EST
lol, that is like 4th grade math
Link Posted: 11/3/2009 1:28:51 PM EST
Originally Posted By Bugalaman:
lol, that is like 4th grade math


yep
Link Posted: 11/3/2009 1:31:10 PM EST
ok ,try this one

2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

A. 2 hours and 24 minutes
B. 3 hours and 12 minutes
C. 3 hours and 44 minutes
D. 4 hours and 10 minutes
E. 4 hours and 33 minutes
Link Posted: 11/3/2009 1:33:31 PM EST
A. 2 hrs 24 minutes.
Link Posted: 11/3/2009 1:34:29 PM EST
Originally Posted By ChuckD05:
A. 2 hrs 24 minutes.


Ok, how did
you get the answer
Link Posted: 11/3/2009 1:39:30 PM EST
[Last Edit: 11/3/2009 1:39:52 PM EST by schapman43]
Originally Posted By ChuckD05:
A. 2 hrs 24 minutes.


That's not correct. The problem does not take into account the time taken by the women yelling at the man for doing it wrong.
Link Posted: 11/3/2009 1:41:52 PM EST
Originally Posted By paul_the_welder:
ok ,try this one

2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

A. 2 hours and 24 minutes
B. 3 hours and 12 minutes
C. 3 hours and 44 minutes
D. 4 hours and 10 minutes
E. 4 hours and 33 minutes



Sally & John are painting the same house.
It takes Sally 4 hours to paint that house. It takes John 6 hours to paint that same house. Lets now divide those numbers by two, if we equally divide the work.
Sallys time is now 2 hours, to Johns 3 hours.
Sally isn't going to sit there when she reaches the halfway point so the work is equal. Therefore, Sally will paint over 50% of the house.
The rate at which she works is faster than John. John would have painted his half in 3 hours, except for the fact that after Sally was finished with her half, she kept working to decrease the amount of time John has to paint.
This gives us the only logical answer in the above bank. 2 Hours and 24 minutes.
Link Posted: 11/3/2009 1:49:09 PM EST
Originally Posted By paul_the_welder:
ok ,try this one

2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

A. 2 hours and 24 minutes
B. 3 hours and 12 minutes
C. 3 hours and 44 minutes
D. 4 hours and 10 minutes
E. 4 hours and 33 minutes



Do you have any pics of Sally?

This makes a huge difference.
Link Posted: 11/3/2009 1:58:43 PM EST

well I got 2 1/2. I thought there was some super technical way to come up with 2:24. thanks!

Originally Posted By ChuckD05:
Originally Posted By paul_the_welder:
ok ,try this one

2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

A. 2 hours and 24 minutes
B. 3 hours and 12 minutes
C. 3 hours and 44 minutes
D. 4 hours and 10 minutes
E. 4 hours and 33 minutes



Sally & John are painting the same house.
It takes Sally 4 hours to paint that house. It takes John 6 hours to paint that same house. Lets now divide those numbers by two, if we equally divide the work.
Sallys time is now 2 hours, to Johns 3 hours.
Sally isn't going to sit there when she reaches the halfway point so the work is equal. Therefore, Sally will paint over 50% of the house.
The rate at which she works is faster than John. John would have painted his half in 3 hours, except for the fact that after Sally was finished with her half, she kept working to decrease the amount of time John has to paint.
This gives us the only logical answer in the above bank. 2 Hours and 24 minutes.


Link Posted: 11/3/2009 2:02:28 PM EST
[Last Edit: 11/3/2009 5:01:09 PM EST by RedFalconBill]
X = number of hours it would take Sally and John to paint the house together.

In one hour they would, combined, paint 1/X of the house.

In one hour Sally can paint 1/4 of the house.

In one hour John can paint 1/6 of the house.

Therefore the equation would look like this:

1/4 + 1/6 = 1/X or, 3/12 + 2/12 = 1/X

5/12 = 1/X

Now, times both sides by 12X

12X* (5/12) = (1/X)* 12X

This leaves you with:

5X = 12 or 2.4

So, the answer is 2.4 hours, or 2 hours, 24 minutes.
Link Posted: 11/3/2009 2:05:00 PM EST
[Last Edit: 11/3/2009 2:06:23 PM EST by Sokarul]
here is how you do it

Use a number for the area of the house, i chose 100.
100/4 hr = 25
100/6 hr= 16.6666666666
Add the two rates together to get a combined rate
41.6666666666666666666

divide the area of the house by the new rate
100/41.66666=2.40
You then need to change the .40 to be based on 60 minutes in an hour. So 60 minutes *.40=24 minutes
Thus the answer of 2 hours and 24 minutes.

Edit: booo I was too slow.
Link Posted: 11/3/2009 2:08:23 PM EST
Originally Posted By schapman43:
Originally Posted By ChuckD05:
A. 2 hrs 24 minutes.


That's not correct. The problem does not take into account the time taken by the women yelling at the man for doing it wrong.


Now thats fuckin' funny!
Link Posted: 11/3/2009 2:09:52 PM EST
Sally paints 100% of a house in 240 minutes and John paints 100% of a house in 360 minutes.

Sally paints 10/24 % of the house every minute.
John paints 10/36 % of the house every minute.

Between the two of them they can paint 25/36 % of the house every minute. (adding the fractions together and reducing... (10/24 x 3 = 30/72) + (10/36 x 2 = 20/72) = 50/72 = 25/36 )

100 x 36 / 25 = 144 minutes to paint the house.

144 minutes = 2 hours 24 minutes.
Link Posted: 11/3/2009 2:11:52 PM EST
Sally paints .25 of the house each hour (1/4)
John paints .167 of the house each hour (1/6)

Together, they paint .417 of the house each hour

1/.417 = 2.398 hours for both of them to paint the entire house together

converting 2.398 hours into hours:minutes, you get 2:24

Link Posted: 11/3/2009 2:14:25 PM EST
[Last Edit: 11/3/2009 2:15:39 PM EST by MarkNH]
Everyone except RedFalconBill an I get a F for rounding errors.... teachers are always assholes about "show me your calculations" to make sure you aren't just getting an approximate answer and choosing the multiple choice answer that is closest.

Link Posted: 11/3/2009 2:21:33 PM EST
42...always
Link Posted: 11/3/2009 2:48:52 PM EST
Man I feel stupid
Link Posted: 11/3/2009 2:56:02 PM EST
Link Posted: 11/3/2009 2:59:53 PM EST
this is why I had to take every math class I took in college twice
Link Posted: 11/3/2009 3:01:43 PM EST
umm....carry the 2.......
Link Posted: 11/3/2009 3:12:41 PM EST
remember " is over of is percent over 100"

or

is/of = x/100

so " 4 is 80 percent of 5"

or 4/5 (Is/of) = 80/100 (percent over a hundred)

and yes I realize the phrase "percent over a hundred" is incorrect. Just know the difference and go with it.

So A what is X percent of B? => A/B = X/100
Link Posted: 11/3/2009 3:12:50 PM EST
0 hours. They hire illegals to paint house and fuck in the upstairs bedroom.
Link Posted: 11/3/2009 5:03:30 PM EST
Originally Posted By Mosspointers:
0 hours. They hire illegals to paint house and fuck in the upstairs bedroom.


While this is the most accurate answer, I do not think that any teacher would give you a lot of credit for it.
Link Posted: 11/3/2009 5:05:15 PM EST
Originally Posted By paul_the_welder:
4. The sales price of a car is $12,590, which is 20% off the original price. What is the original price?


12590/x=80/100

Solve for x.
Link Posted: 11/3/2009 7:43:29 PM EST
[Last Edit: 11/3/2009 7:44:36 PM EST by RedFalconBill]
Originally Posted By paul_the_welder:
4. The sales price of a car is $12,590, which is 20% off the original price. What is the original price?

A. $14,310.40
B. $14,990.90
C. $15,290.70
D. $15,737.50
E. $16,935.80


You could also do it this way.

12,590 = 0.80X

10*(12,590) = 10*(0.80X)

125,900 = 8X

125,900/8 = X

15,737.5 = X

ETA: There are many ways to get the answer.
Link Posted: 11/3/2009 7:49:37 PM EST
Originally Posted By paul_the_welder:
ok ,try this one

2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

A. 2 hours and 24 minutes
B. 3 hours and 12 minutes
C. 3 hours and 44 minutes
D. 4 hours and 10 minutes
E. 4 hours and 33 minutes




John is a union painter.

He'll paint the fucking house when he's good and damn ready and not a minute before.

You got a problem wit dat talk to the super.
Link Posted: 11/3/2009 8:03:31 PM EST
4 hours 10 minutes, I know john and he would be on the couch watching the game except for the nooner at half time.
Link Posted: 11/3/2009 8:10:01 PM EST
Originally Posted By hcook:
Let's make variable P = original Price

P x .8 = $12,590

P = $15,737.50




The step not shown above is to divide both sides by .8

P x .8/.8 = $12,590/.8

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