Question

PLEASE!!!!!! Help ASAP!!!!!

Answer 1

Heath needs to end up with 10L of solution, 

of which 9L is bleach. So let m = liters of 20% 

solution needed. Then .20m liters of that are bleach. 

He must then add p liters of bleach to make 

a total of 10 L. That is, p + m = 10. So the system is 

m + p = 10, .20m + p = 9. Solving, 

m = 1.25 L 20% solution, and thus p = 8.75 L bleach.