Fresh grapes contain 90% water by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 20 kg of fresh grapes? Answers:
A) 2 kg
B) 2.5 kg
C) 2.4 kg
D) None of these
E) Cannot be determined
Explanation :   Fresh grapes contains 10% pulp.   So, 20 kg fresh grapes contains 2kg pulp.   Dry grapes contain 80% pulp.   2kg pulp would contain 2/0.8 = 20/8= 
<gadget id="calculator">20/8</gadget>
<output>5/2 = around 2.5</output>
2.5 kg dry grapes.   Answer : 2.5 kg
<result>B</result>
Fresh grapes contain 90% water by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 20 kg of fresh grapes?