Some of 15%-intensity red paint is replaced with 25% solution of red paint such that the new paint intensity is 30%. What fraction of the original paint was replaced?
Pick one
A) 1/5
B) 1/3
C) 1/2
D) 3/2
E) 3/5
Let total paint = 1   Let amount replaced = x   15 (1-x) + 25x = 30   x = 3/2   ANSWER:3/2
<result>D</result>
Some of 15%-intensity red paint is replaced with 25% solution of red paint such that the new paint intensity is 30%. What fraction of the original paint was replaced?