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kevincan
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GMAT 1: 790 Q51 V51
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GMAT 1: 790 Q51 V51
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So lets start by taking HL200 = x, HL100 = y.
The stem says that 7/12 of the total do not buy anything if something is unavailable.

We know that 3/5 of x buy HL100 when it is unavailable which means 2/5 of x dont buy anything.
Similarly 1/20 of y buy HL200 when it is unavailable which means 19/20 of y dont buy anything.

Now simply equate:

3/5x + 19/20y = 7/12(x+y)

Solve the above equation and bring x and y on either side you will get:
x=2y.

Question is: What is x/Total = x/x+y = 2y/(2y+y) = 2/3.

Hope it helps.
SNEHAVENU
How do we solve this?
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The question is perfect, kindly refer to my thread above if you need any help.
shashag
Yes, feels like some data point is missing

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Adit_
So lets start by taking HL200 = x, HL100 = y.
The stem says that 7/12 of the total do not buy anything if something is unavailable.

We know that 3/5 of x buy HL100 when it is unavailable which means 2/5 of x dont buy anything.
Similarly 1/20 of y buy HL200 when it is unavailable which means 19/20 of y dont buy anything.

Now simply equate:

3/5x + 19/20y = 7/12(x+y)

Solve the above equation and bring x and y on either side you will get:
x=2y.

Question is: What is x/Total = x/x+y = 2y/(2y+y) = 2/3.

Hope it helps.

3/5x + 19/20y = 7/12(x+y)

You made a small typo
Instead of 3x/5 it should be 2x/5

Thank you for your solution!
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Harsha
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