David drives 210 miles a week for work. he fills his petrol tank twice a week. each fill up is for 42 litres. assuming he uses all of the petrol each week and only uses the car to travel to and from work, what is the mileage per litre of his car?

David drives 210 miles a week for work. That means the car is used 210miles/week

He fills his petrol tank twice a week. Each fill up is for 42 litres
That means he fill the tank 2x42litre= 84 litres/week.

The mileage should be : (210miles/week)/ (84 litres/week)= 2,5miles/litre

 2,5miles/litre