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Question
The mean weight of 6 children is 35 kg. When a new boy joined the group, the mean weight becomes 36 kg. What is the weight of the new boy?
Sum
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Solution
The mean weight of 6 children is 35 kg.
Total weight of 6 children = mean × number of children
= 35 × 6
= 210 kg
The mean weight of the 7 children is 36 kg.
Total weight of 7 children = mean × number of children
= 36 × 7
= 252 kg
Weight of the new boy = Total weight of 7 children − Total weight of 6 children
= 252 − 210
= 42 kg
The weight of the new boy is 42 kg.
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