Question 1004570
Call the amount of 80% solution you use, x.
Then 47-x is the amount of 10% solution used.
The set up is then
.80x + .10(47-x) = .24(47)
.80x + 4.7 - .10x = 11.28
.70x = 6.58
x = 9.4 mL of 80%
47-x = 37.6 mL of 10%