Round trip = 4 Miles
Total Distance = 300 Miles
Miles already Driven = 100 Miles.
300 Miles - 100 Miles =200 Miles.
200 Miles / 4 Miles = 50 (Miles cancel put). So, he can drive his car for the next 50 days according to the equation. (There is no set/particular equation for these kid of problems).
7 + 5 = 12 so is an even number that the ticket the choose
932,880 would be the answer