Question

There are 4 children. The average of first three
is 15 kg and that of the last 3 is 16 kg. If the
last number is 19 kg, the first is
(a) 15 kg
(b) 16 kg
(c) 18 kg
(d) None of these
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Answer 1

Answer:

Correct answer is ( b ) 16 kg