5 dry raisins were placed in each of the two beakers containing 50 mL of water. After four hours, the raisins were taken out and wiped. For calculating the percentage of water absorbed by raisins, the raisins should have been weighed:

(1) only before placing in water

(2) only after four hours of their being in water

(3) both before and after placing in water

(4) before and at intervals of every hours

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Solution

The formula for calculating the percentage of water absorbed = $\frac{Final weight - Initial weight}{Initial weight} \times 100$
So, for calculating the percentage of water absorbed by raisins, they should have been weighed both before and after placing in water.

Hence, the correct answer is option 3.

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The formula for calculating the percentage of water absorbed = Final weight-Initial weightInitial weight×100 So, for calculating the percentage of water absorbed by raisins, they should have been weighed both before and after placing in water. Hence, the correct answer is option 3.