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Mathematics, 23.11.2019 02:31 brooklyn4682

Acertain list consists of 21 different numbers. if n is in the list and n is 4 times the average(arithmetic mean) of the other 20 numbers in the list, then n is what fraction of the sum of the 21 numbers in the list?
(a) 1/20
(b) 1/6
(c) 1/5
(d) 4/21
(e) 5/21

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