SAT Math Practice Question #2503 (Medium) | Test Citadel
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SAT Math Difficulty: Medium

Digital SAT Math Practice Question #2503

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If the mean of five numbers is 18, and four of the numbers are 12, 15, 20, and 22, what is the fifth number?
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Socratic AI Engine Step-by-Step Derivation
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⚡ 15-Second Desmos Speed Hack

Desmos / Statistical Reason: Filter conditional probability denominators carefully — 'out of what total' is always the key.

Masterclass Solution & Distractor Trap Analysis

Sum of five numbers $= 5 \times 18 = 90$. Sum of four $= 12 + 15 + 20 + 22 = 69$. Fifth number $= 90 - 69 = 21$....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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