How many quarts of pure antifreeze must be added to 5 quarts of a 20​% antifreeze solution to obtain a 60% antifreeze​ solution?

Question

Help Please

Answer 1

Let a = the amount of pure antifreeze

 

0.2(5) + a = 0.6(a + 5)

1 + a = 0.6a + 3

0.4a = 2

a = 5