Answer:
it would be 101 i believe
Well first you have to divide 620/20 which is 31. So his car goes 31 miles per gallon so you have 2 gallons and .25 of a gallon. So first off 2*31=62 miles then the 1/4 or .25. Multiply the 31 by .25 which is 7.75 now add 62 and 7.75 and you get how far his car can go.
62+7.75=69.75 miles
Well then, you do
850 = 50x + 250
-250 -250
600 = 50x
/50 /50
12 = x
or
x = 12
