Question 981339: How many gallons of a 70% antifreeze solution must be mixed with 70 gallons of 10% antifreeze to get a mixture that is 60% antifreeze?
I you have gallons of 70% solution, then gallons is pure stuff. If you have 70 gallons of 10% solution, then gallons of pure stuff. If you mix gallons with gallons, you have gallons, and 60% of this, or is pure stuff. The amount of pure stuff has to equal the amount of pure stuff, so:
Just solve for .
John
My calculator said it, I believe it, that settles it
