The average of a set of 20 members is P. If one of the numbers from the set is replaced with 58, then the average becomes (P – 2). What is the value of the number that is replaced?
A.60
B.98✓ Correct
C.104
D.94
Explanation
Total of 20 numbers = 20P. After replacement: (20P – x + 58)/20 = P–2 → 20P – x + 58 = 20P – 40 → x = 58 + 40 = 98.
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