SOLUTION: How many mL of a 20% acid should Paul mix with a 60% acid solution to make 100 mL of 50% acid solution?

Question 691502: How many mL of a 20% acid should Paul mix with a 60% acid solution to make 100 mL of 50% acid solution?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 20% solution needed
Let = ml of 60% solution needed
given:
(1)
(2)
---------------------------
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
25 ml of 20% solution is needed
75 ml of 60% solution is needed
check:
(2)
(2)
You can finish the check

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