Acar rental agency advertised renting a car for 26.95$ per day and 0.26$ per mile. if david rents this car for 3 days how many whole miles can he drive on a 250$ budget?

Ok so we let's assume the amount of whole miles David can drive on a $250 budget is "x" miles. This means that if he uses it for 3 days,

because he isn't allowed to exceed that limit.
So:

And:

However, David can only drive in whole miles, and doesn't have enough money to drive the extra 0.43 miles, hence we round down to 650.

So he can drive 650 miles without exceeding his limit.

Hope this helped