He used 1/3 of his tank because 1 - (2/3) = 1/3

He used 4 gallons of gas because 12 x (1/3) = <<12*(1/3)=4>>4

He drove 20 miles because 2 x 10 = <<2*10=20>>20

He gets 5 miles per gallon because 20 / 4 = <<20/4=5>>5

# Answer

5
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Jim is wondering how many miles each gallon of gas gets him. His gas tank is 12 gallons. He has 2/3 of a tank left after he drives to and from work, which is 10 miles away from his house. How many miles per gallon does he get?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
Jim is wondering how many miles each gallon of gas gets him. His gas tank is 12 gallons. He has 2/3 of a tank left after he drives to and from work, which is 10 miles away from his house. How many miles per gallon does he get?
train