Quant Multiple Choice — SAT Question of the Day

QOD2015_0917
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Quant Multiple Choice — SAT Question of the Day

QOD2015_0922
Explanation
Questions involving newly defined operations can sometimes seem tricky because they often include unfamiliar symbols or rules. However, by following the operation closely and carefully substituting the proper terms, a step by step process can always lead to the correct answer. Here we see that any expression m$n can be replaced with mn − m − n. We will replace each m with 8 and each n with 4 to solve.

Inserting 8 for m, and 4 for n, we get: m$n = mn − m − n 8$4 = (8)(4) − 8 − 4 8$4 = 32 − 12 = 20

The correct answer is (C).

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