# To conduct a scientific experiment, students need to mix 90mL of a 3% acid solution. They have a 1% and a 10% solution available. How many mL of the 1% solution and of the 10% solution should be combined to produce 90mL of the 3% solution?

Oct 15, 2015

Then $\frac{2}{9}$ of the stronger stuff has to be present, or in this case $20 m L$ (and of course $70 m L$ of the weaker stuff).