Some part of the 50% solution of acid was replaced with the equal amount of 30% solution of acid.
Some part of the 50% solution of acid was replaced with the equal amount of 30% solution of acid. As a result, 40% solution f acid was obtained. what part of the original solution was replaced?
Answer/Solution
1/2
Steps/Work
Let X = Part of acid solution replaced, then 1-X will be the parts not replaced.
(1-X)*0.5 + 0.3*x = 0.4
0.5 - 0.5X +0.3X = 0.4
-0.2X = -0.1
X=1/2
So the answer is C
(1-X)*0.5 + 0.3*x = 0.4
0.5 - 0.5X +0.3X = 0.4
-0.2X = -0.1
X=1/2
So the answer is C