Question

Out of four numbers the average of the first three is 16

Let three numbers be a, b and c respectively a b c 16 x 3 48 .i b c 20 15 x 3 45 b c 45 20 25 ..ii By Subracting, equation i ii a 48 25 23

and that of the last three is 15. If the last number is 20 then the first number is

A 23

B 25

C 28

D 21

E None of these

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