Question 946574
10 gallon at 15% + x gallon at 50% = 10+x gallon at 35% We will rewrite:

.15(10) + .50(x) = .35(10+x)

1.5 + .50x = 3.5 + .35x Subtract 1.5 from both sides:

.5x = 2 + .35x now subtract .35x from both sides and you get:

.15x = 2 Finally divide both sides by .15:

x = 13.33 gallon of 50% solution.