Question

Jack purchases 12 gallons of gas on Monday. He uses 2/3 of the amount purchased commuting to and from work during the week and an additional 2 gallons running errands. How many gallons of gas does john use from work and errands?

Answer 1

10 gallons because 2/3 of 12 is 8 and 8+2 is ten.

Answer 2

Answer: Using operations with fractions, John uses 10 gallons from work and errands.

Solution:

Jack purchases 12 gallons of gas on Monday.

He uses 2/3 of the amount purchased commuting to and from work during the week:

(2/3)(12)=(2/3)(12/1)=(2*12)/(3*1)=24/3=8

Then John uses 8 gallons commuting to and from work during the week.

And an additional 2 gallons running errands.

John uses in total from work and errands= 8 gallons+2 gallons

John uses in total from work and errands= 10 gallons