Ivan's gas tank is 1/2 full. After he buys 7 gallons of gas, it is 5/6 full. How many gallons can Ivan's tank hold?

Question

 Ivan's gas tank is
1/2
full. After he buys
7
gallons of gas, it is
5/6
full. How many gallons can Ivan's tank hold?

Answer 1

1/2 = 3/6   so 7 gallons = 2/6  (3/6 and 2/6 = 5/6)  So 7 = 2/6 or 1/3 so two thirds more would be the answer. 

 

so if 7 is 1/3 of something, to get 3/3 or 1 whole full tank, you would multiply 7 x 3 - _____ gallons

Answer 2

g represents the size of the tank

(1/2)g + 7 = (5/6)g

 

Can you solve for g?