Question

A sugar solution was made by mixing 7 ml of a 50% sugar solution and 3 ml of a 80% sugar solution. Find the concentration of the new mixture.

Answer 1

amount of sugar equation: x + y = 10
percent of sugar equation: .50x + .80y = 10z

We know x = 7, y = 3, therefore:

7 + 3 = 10
.50(7) + .80(3) = 10(z)

Solve for z