The mean weight of 24 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 g. Find the weight (in kg) of the teacher?
Explanation:
If teacher's weight was 42 kgs, the new average would not have changed.
New average of 25 people (including teacher) increases by 400 gms because teacher's weight is more than the original average weight.
Extra weight brought by the teacher = 25 × 400 = 10000 gms = 10 kgs.
∴ Weight of the teacher = 42 + 10 = 52 kgs.
Hence, option (a).
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