How many gallons of a 80% antifreeze solution must be mixed with 100 gallons of 25% antifreeze to get a mixture that is 70% antifreeze? use the six-step method.

We have 100 gallons of 25% antifreeze.
How much of 80% antifreeze do we need to add to make a 70% solution?

.25 * 100 + .80x = .70 * 100 + x
25 + .80x = 70 + .7x
.1x = 45
x = 450 gallons of 80% must be added to make a 70% solution.

Google it that might work