Fresh grapes contain 80% water by weight and raisins obtained by drying fresh grapes contain 25% water by weight. How many kgs of fresh grapes are needed to get 20kgs of raisins?  Choose the correct choice:
A) 75 kgs
B) 64kgs
C) 72 kgs
D) 65 kgs
E) 70 kgs
The weight of non-water in 20 kg of dried grapes (which is 100-25= 
<gadget id="calculator">100-25</gadget>
<output>75</output>
75% of whole weight) will be the same as the weight of non-water in x kg of fresh grapes (which is 100-80= 
<gadget id="calculator">100-80</gadget>
<output>20</output>
20% of whole weight), so 20*0.75= x*0.2 --&gt; x = 75.   75 kgsnswer: 75 kgs.
<result>A</result>
Fresh grapes contain 80% water by weight and raisins obtained by drying fresh grapes contain 25% water by weight. How many kgs of fresh grapes are needed to get 20kgs of raisins?