Algebra homework

Question

Jane needs to make 10 liters of a solution that is 10% salt. She has a solution that is 5% salt and a solution that is 25% salt. How much of each solutions should Jane use.

A. 4 liters of the 5% salt and 6 liters of the 25% salt solution

B. 7.5 liters of the 5% salt and 2.5 liters of the 25% salt solution

C. 8 liters of the 5% salt solution and 2 liters of the 25% salt solution

D. 2.5 liters of the 5% salt solution and 7.5 liters of the 25% salt solution

Answer 1

.05x + .25(10-x) = .10(10) = 1

-.2x = 1 - 2.5 = -.1.5

x = 150/20 = 7.5

correct answer is B