Question 25939
1.
x+25(2000-x)=5(2000)
x-25x+50000=10000
-24x=-40000
x=1666.7 (rounded)
2000-1666.7=333.3


Hence, you need to use 1666.7ml of 1% and a 333.3ml of 25%.


2.
10x+18(20)=15(x+20)
10x+360=15x+300
-5x=-60
x=12


20-12=8


Hence, about 12L of 15% solution must be added, and about 8L of 10% solution must be added.
PAUL<>