Question

A certain drug is made from only two ingredients: compound A and compound B. There are 5 milliliters of compound A used for every 7 milliliters of compound B. If a chemist uses 485 milliliters of compound A, how many milliliters of the drug will be made?

Answer 1

Use ratios
A/B=5/7=485/b
cross multiply and solve for b
b=485*(7/5)
=679
Total mass
=Ma+Mb
=485+679
=1164 mL