Question

A family has two cars. The first car has a fuel efficiency of
15
miles per gallon of gas and the second has a fuel efficiency of
35
miles per gallon of gas. During one particular week, the two cars went a combined total of
1650
miles, for a total gas consumption of
70
gallons. How many gallons were consumed by each of the two cars that week?

Answer 1

the first car consumed 21 gallons while the second car consumed 49 gallons. here is the how it's done.
for the first car gallons consumed is 15/50x70= 21 gallons
the second car consumed 35/50x70=49 gallons