datonman wrote: If 893 x 78 = P, which of the following is equal to 893 x 79?

A) P+1
B) P+78
C) P+79
D) P+893
E) P+894

Here's the solution you referred to:

Given: 893 x 78 = P

893 x 79 = 893 x (78 + 1)
= (893)(78) + (893)(1)
= P + 893
= D

Cheers,
Brent

Hi All,

We're told that 893 x 78 = P. We're asked which of the following is equal to 893 x 79.

Most GMAT questions are designed so that they can be approached in more than one way. Sometimes how you think about the information that you're given can provide a 'logic shortcut' that you can take advantage of (to reduce the amount of work needed to answer the question and save time).

Here, we're told that P = (78)(893). If you look at that calculation a certain way, it's the same as saying "P equals seventy-eight 893s." The question asks which of the following is equal to 'seventy-nine 893s?" Looking at the information - and the question - in those terms, the answer is pretty clear: P and another 893.

Final Answer: D

GMAT assassins aren't born, they're made,
Rich