If grapes are 92% water and raisins are 20% water, then how many kilograms did a quantity of raisins, which currently weighs 5 kilograms, weigh when all the raisins were grapes? (Assume that the only difference between their raisin-weight and their grape-weight is water that evaporated during their transformation.)
Answers:  A) 50  B) 54  C) 55  D) 56  E) 60
Let x be the original weight.   The weight of the grape pulp was 0.08x.   Since the grape pulp is 80% of the raisins, 0.08x = 0.8(5).   Then x = 50 kg.   The answer is 50.
<result>A</result>
If grapes are 92% water and raisins are 20% water, then how many kilograms did a quantity of raisins, which currently weighs 5 kilograms, weigh when all the raisins were grapes? (Assume that the only difference between their raisin-weight and their grape-weight is water that evaporated during their transformation.)