A gas tank that is 1/3 full requires 6 gallons to make it 5/6 full. What is its full capacity?
A
10 gallons
B
6 gallons
C
18 gallons
D
12 gallons
Correct Answer: 12 gallons
1/3 x + 6 = 5/6 x = > 6 = 1/2 x ∴x = 12