Hi All,

Since this question asks for the TOTAL number of animals, and the answers are numbers, this is a perfect opportunity to TEST THE ANSWERS.

We're told a few Facts about a group of animals:

1) There are D total animals

2) 12 of them are sold at a 10% profit

3) The rest are sold at a 20% loss

4) The profits and losses "cancel out"

We're asked to solve for D.

Since 12 animals were sold for a profit, while the rest were sold for a loss, the total number of animals MUST be MORE than 12. Eliminate A and B.

Since we need the profits and losses to cancel out, we're likely looking for a situation in which there were FEWER animals sold for a loss than were sold for a profit (since each individual 'loss' is so much bigger than each individual 'profit').

Let's TEST Answer C....

IF there were 18 animals, 12 were sold for a profit and 6 were sold for a loss.

IF....each animal costs $100

The 12 that were sold for a 10% profit --> $110 each ---> 12($10 profit each) = $120 profit

The 6 that were sold for a 20% loss ---> $80 each --->6($20 loss each) = $120 loss

Here, the profits and losses cancel out, so C MUST be the answer.

Final Answer:

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

Rich

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Rich Cohen

Rich.C@empowergmat.com

http://www.empowergmat.com

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