If P is the sum of positive odd numbers which are less than 84 and Q is the sum of the positive even integers that are less than 84, what is the value of Q – P ?

Correct answer marked below

- 42

Correct

- 40

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What this question tests

Your fluency with the order of operations, fractions, decimals, and basic number sense — the foundation every quant question leans on.

Applying the order of operations out of sequence or rounding intermediate values before the final step.