Average of weights of 35 students is 45 kg. If we add one more student John then their average becomes 45.5 kg. How much is the weight of John?
(A) 55 kg
(B) 57 kg
(C) 60 kg
(D) 63 kg
(E) 65 kg
Let
be weights of 35 students.
Let weight of John
It is given to us that
kg
(1)
It is also given to us that
kg
(2)
Subtracting (1) from (2), we get
kg
Hence, the answer is (D).
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