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The average weight of a family of 8 members is 56 kg. The grandfather and the grandmother came to visit the family. Now, the average weight of 10 members of the family is 64 kg. Find the average weight (in kg) of the grandparents.

A92

B94

C96

D90

Answer:

C. 96

Read Explanation:

Total weight of 8 members

8×56=448 kg8 \times 56 = 448 \text{ kg}
Total weight of 10 members

10×64=640 kg10 \times 64 = 640 \text{ kg}
Weight of grandparents

640448=192 kg640 - 448 = 192 \text{ kg}
Average weight of grandparents

1922=96 kg\frac{192}{2} = 96 \text{ kg}


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