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Need a Hint?

HINT: You must first calculate how much the dry sponge weighs.

See Answer

ANSWER: 100 grams.

EXPLANATION: At first, 1% of the total weight is the sponge itself (since 99% of the weight is water). Therefore, the sponge weighs 2 grams when dry (1% × 200 grams). After squeezing some of the water out, 2% of the total weight is the sponge itself (since 98% of the weight is water). If we let x represent the total weight of the sponge, then: (2/100) x = 2 grams and therefore x = 100 grams.

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