If grapes are 90% water and raisins are 15% water, then how many kilograms did a quantity of raisins, which currently weighs 12 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.) Choose the correct choice: A) 96 B) 98 C) 100 D) 102 E) 104
Let x be the original weight of the grapes.   The weight of the grape pulp was 0.1x.   Since the grape pulp is 85% of the raisins, 0.1x = 0.85(12 kg).   Then x = 8.5*12= 
<gadget id="calculator">8.5*12</gadget>
<output>102</output>
102 kg.   The answer is 102.
<result>D</result>
If grapes are 90% water and raisins are 15% water, then how many kilograms did a quantity of raisins, which currently weighs 12 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.)