What is the average of ten numbers?

(1) Nine of the numbers sum to 45.
(2) One of the numbers is 15.

Correct answer marked below

Statement (1) ALONE is sufficient

Statement (2) ALONE is sufficient

BOTH statements TOGETHER are sufficient

EACH statement ALONE is sufficient

Statements (1) and (2) TOGETHER are NOT sufficient

Correct

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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.

What is the average of ten numbers?(1) Nine of the numbers sum to 45.(2) One of the numbers is 15.