Question

= How many gallons of a 60% antifreeze solution must be mixed with 60 gallons of 30% antifreeze to get a mixture that is 50% antifreeze?​

Answer 1

120

Explanation:

60 gallons of 30% antifreeze means there are 18 gallons of antifreeze.

Let the number of gallons of 60% antifreeze be x. Then,

`(0.6x+18)/(x+60)=(1)/(2) \\ \\ 1.2x+36=x+60 \\ \\ 0.2x=24 \\ \\ x=129`