Question

A biologist has two brine solutions, one containing 15% salt and another containing 20% salt. How many milliliters of each solution should she mix to obtain 1 L of a solution that contains 19.5S% salt?
______mL, and ________mL

Answer 1

suppose she needs to mix x millileters of 15% salt solution and y millileters of 20% salt solution to obtain 1 liter of 19.5% salt solution
that means that
x+y = 1000
and
0.15x+0.20y=195

Answer 2

so it would be 1000mL and 195mL?