SOLUTION: A chemist has 10 quarts of 10% of acid. She wishes to add enough water to reduce it to a 4% solution. How many quarts of water must she add?

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Question 576224: A chemist has 10 quarts of 10% of acid. She wishes to add enough water to reduce it to a 4% solution. How many quarts of water must she add?
Answer by chana(69) About Me  (Show Source):
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A chemist has 10 quarts of 10% of acid. She wishes to add enough water to reduce it to a 4% solution. How many quarts of water must she add?
sol:
10 q has 10% of acid this implies 1 q is acid , 9q is water
acid and water are in the ratio 1 : 9
in the new solution only 4% is acid ,remaining is water they are in the ratio 1 :24
let x be the volume of water added .
1/( 9x) = 1/24
solving for x you get 15 quarts.