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juliuscarsienly
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If ax + ay = 15, what is x + y + z ? 20 Nov 2008, 02:09
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Question taken from Cracking the GMAT 2009 edition - Princeton Review

If ax + ay = 15, what is x + y + z ?

(1) x = 2
(2) a = 5

My personal answer is E (statement 1 and 2 together is not sufficient) but refer to the answer key, it should be B (statement 2 alone is sufficient but statement 1 is not sufficient)

Kinda confused :roll:

if we used statement 2 to answer the question, we still need to know what is the value of z, right?

advice please (FYI, I did proofread for the question and answer several times)



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scthakur
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If ax + ay = 15, what is x + y + z ? 20 Nov 2008, 02:22
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Please check whether the question asks for (x+y+z) or (x+y+2).
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juliuscarsienly
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If ax + ay = 15, what is x + y + z ? 20 Nov 2008, 02:46
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it is z (like as Zebra) :?

Do you need me to scan it send it personally to you?
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scthakur
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If ax + ay = 15, what is x + y + z ? 20 Nov 2008, 04:28
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Then, it must be a type in their book. Have they given OE?
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juliuscarsienly
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If ax + ay = 15, what is x + y + z ? 21 Nov 2008, 00:49
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Sorry, what is OE?

They give an explanation as follow:

statement (1) gives us a value for x, but we need x+y+d. (which I think should be x+y+z)
Statement (1) is not sufficient. We're down to BCE. Statement (1) might not have seemed mocuh more helpful, BUT using the distributive property, we can rewrite the original equation to read a(x+y+z) = 15.
If a is 5, then x+y+z must equal 3. The correct answer is choice B.

In my humble opinion, with explanation as above and correct answer is B, then the question should be:

If ax+ay+az = 15, what is x+y+z?

advice please,

rgd, Julius
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GmatEnemy
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If ax + ay = 15, what is x + y + z ? 21 Nov 2008, 01:15
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Its definitely a mistake.. Z cant be identified unless anything related to it is given



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