Question

A forester is making a gasoline-oil mixture for a chainsaw engine. The forester has 2 gallons of a mixture that is 29 parts gasoline and 1 part oil. How many gallons of gasoline should the forester add to bring the mixture to 49 parts gasoline and 1 part oil?

Answer 1

1 1/3 gallons should be added.

if 30 parts = 2 gallons
therefore 15 parts = 1 gallon

49-29 = 20

20 - 15 (aka 1 part) = 5
5/15 = 1/3