Three group of 10 kids. The average weight of a kid in each group is 35 kilograms. One more kid joined each group.
i) The average weight of a kid in the first group is still 35 kilograms.(2 mark)
ii) The average weight of a kid in the second group is now 36 kilograms. (2 marks)
iii) The average weight of a kid in the third group is now 34 kilograms. Compute the weight of the new kid in each group.(1 marks)

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Solution

i) Average weight of $10 k i d s = 35 k g$
Total weight of $10 k i d s = 35 \times 10 = 350 k g$
Total weight of $11 k i d s = 35 \times 11 = 385 k g$
Weight of the newly joined kid $= 385 - 350 = 35 k g$
ii) Total weight of 11 kids $= 36 \times 11 = 396 k g$
weight of the newly joined kid $= 396 - 350 = 46 k g$
iii) Total weight of 11 kids $= 34 \times 11 = 374 k g$
weight of the newly joined kid $= 374 - 350 = 24 k g$

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