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When a person aged 39 is added to a group of n people, the average age increases by 2. When a person aged 15 is added in

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When a person aged 39 is added to a group of n people, the average age increases by 2. When a person aged 15 is added in

by BTGModeratorVI » Sun Aug 02, 2020 6:50 am

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When a person aged 39 is added to a group of n people, the average age increases by 2. When a person aged 15 is added instead, the average age decreases by 1. What is the value of n?

(A) 7
(B) 8
(C) 9
(D) 10
(E) 11

Answer: A
Source: Veritas
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