Question

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to obtain a mixture containing a 40% solution of acid?

Answer 1

40

Explanation:

Answer 2

x=40

Explanation:

0.50x + 20(0.20) = 0.40(x + 20)

0.5x+4=0.4x+8

0.1x+4=8

0.1x=4

x=40