GMAT Question of the Day (Nov 24): Arithmetic and Sentence Correction

Math (DS)

If $x$ and $y$ are positive integers, is $x^{16} - y^8 + 345y^2$ divisible by 15?

1. $x$ is a multiple of 25, and $y$ is a multiple of 20
2. $y = x^2$

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Verbal (SC)

The supply of oil being finite has become an economical and political consideration of the first magnitude for all modern industrial nations.

(A) The supply of oil being finite has become an economical
(B) The finite supply of oil has become an economical
(C) That the supply of oil is finite has become an economical
(D) The supply of oil being finite has become an economic
(E) That the supply of oil is finite has become an economic

Answers to the questions: B, E
For explanations please see these threads: math and verbal

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GMAT Question of the Day (Nov 24): Arithmetic and Sentence Correction

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