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Fresh grapes contain 80 % water dry grapes contain 10 % water. If the weight of dry grapes is 250 kg. What was its total weight when it was fresh?

Correct answer: C. 1125 kg

  • A. 1000 kg
  • B. 1100 kg
  • C. 1125 kg
  • D. 1225 kg

Explanation

Dry matter remains unchanged during drying. The 250 kg dry grapes contain 90% dry matter, so dry matter = 250 kg × 90/100 = 225 kg; fresh grapes contain 20% dry matter, so their original mass was 225 kg ÷ 0.20 = 1125 kg. A student may choose a, 1000 kg, by using the 80% water figure as though it were the retained dry matter.

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