In an examination, the Average marks of 7 children was 20, t

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In an examination, the Average marks of 7 children was 20, that of 3 children was 45, that of another 4 children was 15 and that of 2 children was 0. What is the average marks of all the 16 children? (Correct to one decimal place)

[SSC CHSL 10th June 2022 Shift-1 With Answers]

A

20

B

20.9

C

4

D

4.9

EXPLANATION

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