Question

A chemist needs 90 milliliters of a 57% solution but has only 27% and 72% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.

Answer 1

18=18

Explanation:

a=90-b

a=50 mL at 4%

b=40 mL at 40%

check

0.04*50+0.4*40=0.2*90

2+16=18

18=18