Question

A Chemist mixes 10 liters of a solution that is 30% acid with 30 liters of a solution that is 50% acid. What is the percent of acid in the new mixture?

Answer 1

ten liters at 30% is 3 liters. 30 liters at 50% is 15 liters. you have a total of 18 liters of acid and 40 liters all together. so it is
\[\frac{18}{40}=.45=45\%\]

Answer 2

10*.33=3.3L acid
30*.5=15L acid
18.3/40~45%