He uses 15 gallons. Because 270/6 = 45. Meaning he drives 45 miles per gallon. So 675/45=15. 15 gallons he will need to use to drive 675 miles.
initial estimate in 2002 = 103M
Actual cost in 2006 = 142M (103M + 39M)
% over budget = 39/103 = 37.86%
Explanation
In the image, we are given the diameter of the circle as 20 mi. The area of the circle will be calculated as;

Answer

1
_ X 30 = 6
5
0r 30 ÷ 5 = 6
because 6 times 5 = 30
1. 37+20x=117. 2. -37 on both sides
3. 20x=80. 4. Divide 20 by 80. 5. X=4