How many ounces of a 35% alcohol solution must be mixed with 4 ounces of a 40% alcohol solution to make a 37% alcohol solution?

Question

The amount of 35% alcohol solution is?

Answer 1

x = number of ounces of 35% solution

x + 4 = total number of ounces of final mixture at 37%

You can solve this by setting up a weighted combination of the percentages.

35x + 40(4) = 37(x + 4)

Can you solve for x and finish from here?