chrissy28 wrote:
Some part of a 50% solution of acid was replaced with an equal amount of 30% solution of acid. If, as a result, 40% solution of acid was obtained, what part of the original solution was replaced?
A. \(\frac{1}{5}\)
B. \(\frac{1}{4}\)
C. \(\frac{1}{2}\)
D. \(\frac{3}{4}\)
E. \(\frac{4}{5}\)
M25Q30
so we have a mixture in which
Some part of a 50% solution of acid was replaced with an equal amount of 30% solution of acid.
40% solution of acid was obtained
By allegation method, we get the ratio
M1--------M2
50----------30
-------40-----
10-----------10
Mixture will be in the ratio of 1:1
what part of the original solution was replaced?
Total mixture = 2
1/2 was replaced
C
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