Philip M. answered 10/01/17
Tutor
5
(13)
Chemical Engineer, Also Certified H.S. Math/Physics/Chemistry
full tank = x gallons
1/4 x + 10 = 2/3 x
2/3 x - 1/4 x = 10
8/12 x - 3/12 x = 10
5/12 x = 10
x = 24
Check:
24 X 1/4 = 6 gallons
6 gallons + 10 gallons = 16 gallons
16 gallons/24 gallons = 2/3 full , correct