Question 275411
In a chemistry class, 6 liters of 4% silver iodide solution must be mixed with 10% solution to get a 6% solution.  How many liters of 10% solution are needed?

Let the quantity of 10% solution be x liters

4% solution------------------- 10% solution---------------- 6% solution ( mix)

6------------------------------- x  ------------------------  (x+6) liters


0.04x + 0.1x = 0.06*(x+6)

0.14x= 0.06x+0.36

0.14x-0.06x=0.36

0.08x= 0.36

x= 0.36/0.08 

= 4 liters