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प्रश्न
Fresh grapes contain 90% water by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 20 kg of fresh grapes?
पर्याय
2 kg
2.4 kg
2.5 kg
2.6 kg
MCQ
उत्तर
2.5 kg
Explanation :
Weight of fresh grapes = 20kg
Quantity of water in it = 90% of 20
= `90/100xx20` = 18kg
Quantity of pulp in it = (20 -18) = 2 kg
Let weight of dry grapes = y kg
Then, quantity of water in it = 20% of y
= `200/100xx "y"=1/5 "y"`
Quantity of pulp in it = `"y" -1/5"y" =4/5"y"`
∴ `4/5"y" =2 ⇒ "y" = (2xx5)/4=` 2.5kg
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