I just ask this question on the SnapCalc app the answer is in the image
Answer:
5 miles
Step-by-step explanation:
14 - 8.37 means his car still had 5.63 gallons
27.6/5.63 = 4.9
Divide total amount spent by total gallons bought:
47.82 / 16.9 = $2.83 per gallon
I think you got confused with the 50 and 90.
Read my NOTE there it will surely help you answering other questions like this