Question

PLEASE HELP WITHIN ONE HOUR!!!!!!!!!!!!!!!

mr. hackney wants to winterize his motorhome and need 40% antifreeze solution. how much pure antifreeze should he add to 30 liters of 20% antifreeze to make the 40% antifreeze solution???

Answer 1

So the expression for the percentage of antifreeze after adding x gallons is

(30 * .2 + x) /(30+x). This is equal to .4. Solve and you should get the answer