Fresh grapes contain 90% by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 20 kg of fresh grapes?
Select the correct option:
A) 2 kg
B) 2.4 kg
C) 2.5 kg
D) 10 kg
E) none of these
The weight of non-water in 20 kg of fresh grapes (which is 100-90= 
<gadget id="calculator">100-90</gadget>
<output>10</output>
10% of whole weight) will be the same as the weight of non-water in x kg of dried grapes (which is 100-20= 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80% of whole weight), so 20∗0.1=x∗0.8--&gt; x=2.5   Answer: 2.5 kg.
<result>C</result>
Fresh grapes contain 90% by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 20 kg of fresh grapes?