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A certain quantity of 40% solution is replaced with 25% solution such

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A certain quantity of 40% solution is replaced with 25% solution such [#permalink] New post   09 Nov 2022, 06:25
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A certain quantity of 40% solution is replaced with 25% solution such that the new concentration is 35%. What is the fraction of the solution that was replaced?


(A) 1/4
(B) 1/3
(C) 1/2
(D) 2/3
(E) 3/4


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Re: A certain quantity of 40% solution is replaced with 25% solution such [#permalink] New post   09 Nov 2022, 11:36
May someone explains the question ?
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Re: A certain quantity of 40% solution is replaced with 25% solution such [#permalink] New post   09 Nov 2022, 11:56
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oringal quantity of solution=1
solution replaced = x

0.4 *(1-x)+0.25x= 0.35 *1

0.05= 0.15 x--> x= 1/3
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Re: A certain quantity of 40% solution is replaced with 25% solution such [#permalink] New post   09 Nov 2022, 11:57
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