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
You can do this with ratios.
The difference between 1% and 10% is 9.
You need to go up from 1% to 3% -- a difference of 2.