10 balls weighing 3000 g in total are on the left pan of a balance. A watermelon on the right pan balances them exactly. What is the total weight of 2 watermelons and 5 balls?

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A 7.5 kg
B 65g
C 6500g
D 7500kg

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Answer: A. 7.5 kg

To calculate the answer we need to know the weight of the watermelon. 10 balls=3000g=watermelon. 2 watermelons would be 6000g and to know the weight of 5 balls we need to kow the weight of 1 ball. And 1 ball equals 300g so 5 balls would be 1500g. 6000g+1500g=7500g=7.5kg

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10 balls weighing 3000 g in total are on the left pan of a balance. A watermelon on the right pan balances them exactly. What is the total weight of 2 watermelons and 5 balls?

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