Question

Medal
A hair dye is made by blending a 7% hydrogen peroxide solution and a 4% hydrogen peroxide solution. How many milliliters of each are used to make a 300- milliliters solution that is 5% hydrogen peroxide?

Answer 1

x will be the amount of 7% solution
so,

0.07x+0.04(300-x)=0.05(300)
0.07x+12-0.04x=15
0.07x+12-12-0.04x=15-12
0.03x=3
x=100 ml of 7% solution is needed

300-x
= 300-100
= 200 ml of 4% solution is needed

Answer 2

Did you get it?

Answer 3

yes i understand it now thank you :)