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Quant Multiple Choice — SAT Question of the Day

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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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