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

Answer: Option B

Quantity of water in 250 kg dry grapes,
$$=\frac{10}{100}\times 250=25\text{kg}$$
Then, pulp of grapes = 225 kg
We get 20 kg pulp in 100 kg fresh grapes.
To get 225 kg pulp , we need fresh grapes,
$$\text{ = }\frac{100\times 225}{20}=1125\text{kg}$$