How many gallons of a 90​% antifreeze solution must be mixed with 60 gallons of 30​% antifreeze to get a mixture that is 80​% ​antifreeze? Use the​ six-step method.

Answer 1

x(.90) + 60(.30) = y(.80)

You have two things you don't know, x and y, the amount of 90% and the amount of total.

You have only one equation. You need more information to solve this. You need two equations to solve for two unknowns.