The average weight of Mohan, Mohammad and Ashish is 46 kg. If the average weight of Mohan and Mohammad be 39 kg and that of Mohammad and Ashish be 47 kg, then the weight of Mohammad (in kg) is:
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Correct answer: D
Explanation
The correct answer is option 4 i.e. 34
Let Mohan = M, Mohammad = N, Ashish = A
Average of all three = 46
(M + N + A) ÷ 3 = 46
M + N + A = 138 …(1)
(M + N) ÷ 2 = 39
M + N = 78 …(2)
(N + A) ÷ 2 = 47
N + A = 94 …(3)
From (1) and (2):
(M + N + A) − (M + N) = 138 − 78
A = 60
From (3):
N + 60 = 94
N = 34