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Fresh Grapes contain 90% water by wt. Dried grapes contain 20% water by %age. What will b wt of dried grapes when we begin with 20 kg fresh grapes?

4 kg
2.5 kg
3.5 kg
None of these
Explanation:

According to the question, In 20 kg there was 18 kg water and the rest 2 kg was pure grapes which will never reduce.

So, when the grapes get dried and there is only 20% water then rest 80 kg will be pure grapes which is 2 kg.

Let x be total quantity then -----x $\times$ 80/100 = 2.

On solving, we get x=2.5

Hence, the required weight of grapes = 2.5 kg.

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