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Some part of the 50% solution of acid was replaced with the

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Some part of the 50% solution of acid was replaced with the [#permalink] New post 23 Nov 2005, 20:33
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Some part of the 50% solution of acid was replaced with the equal amount of 30% solution of acid. As a result, 40% solution of acid was obtained. What part of the original solution was replaced?

A. 1/5
B. 1/4
C. 1/2
D. 3/4
E. 4/5
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 [#permalink] New post 23 Nov 2005, 21:41
let initial solution quantity: n
amount replaced: x

(0.5 n - (0.5 x - 0.3 x)) / n = 40/100
(0.5n - 0.2x)/n = 2/5
solving:
n/x = 2/1
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  [#permalink] 23 Nov 2005, 21:41
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