Answer:
- 30 mL of 50% solution
- 120 mL of 25% solution
Explanation:
Let x represent the amount of 50% solution LeBron needs. Then (150-x) is the amount of 25% solution, and the total amount of acid in the mix is ...
50%(x) +25%(150 -x) = 30%(150)
.25x + 37.5 = 45 . . . . . simplify
.25x = 7.5 . . . . . . . . . . . subtract 37.5
x = 7.5/.25 = 30 . . . . divide by the coefficient of x; mL of 50% solution
150-x = 120 . . . . . . . . mL of 25% solution
LeBron should mix 120 mL of 25% solution with 30 mL of 50% solution to make the 30% solution.