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Re: My comprehensive Quant Flashcards! [#permalink]

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10 Mar 2011, 06:06

miguelmick wrote:

there are a few typing errors, but it is easy to notice them. If you have any doubt, please contact me!

nycgmat2011 wrote:

What kind of mistakes?

The revenue from pen sales was up 5%, but the revenue from pencil sales declined 13%. If the overall revenue was down 1%, what was the ratio of pen and pencil revenues? 105 + 0.87x = 0.99(100 + x) 6 = 0.12x x = 50 So, the ratio is 2:1

Re: My comprehensive Quant Flashcards! [#permalink]

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11 Mar 2011, 14:46

2

This post received KUDOS

Let's try your solution:

If the revenue from pen sales is 500, then the revenue from pencil sales would be 200, making the combined rate 700. The revenue from pen sales went up 5%, so it is now 525. And the revenue of pencil sales went down 13%, so it is now 174. Your combined revenue would be 699, which is not 1% lower than 700. You needed to find a 693 in this calculation in order to confirm your answer.

If you try the ratio 2:1, you will see that if the revenue from pen sales is 200 and the revenue from pencil sales is 100, your combined revenue would be 300. Adding 5% to pen revenues and reducing 13% to pencil revenues would yield 210 and 87 respectively. If you sum both, you get a total revenue of 297, which is 1% lower than 300.

I don't know any easier way to solve this problem. The best way is always to attribute a quantity for one of the variables do the equation shown in that example.

Hope this helps!

Cheers.

abogomolov wrote:

miguelmick wrote:

there are a few typing errors, but it is easy to notice them. If you have any doubt, please contact me!

nycgmat2011 wrote:

What kind of mistakes?

The revenue from pen sales was up 5%, but the revenue from pencil sales declined 13%. If the overall revenue was down 1%, what was the ratio of pen and pencil revenues? 105 + 0.87x = 0.99(100 + x) 6 = 0.12x x = 50 So, the ratio is 2:1

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