I believe the possible volumes are <span>5 ft long, 4 ft wide and 2 ft deep 5 ft long, 3 ft wide and 2 ft deep 5 ft long 2 ft wide and 2 ft deep 5 ft long, 1 ft wide and 2 ft deep</span>
Let x = mileage 98 >= 35 + .21x Solving for x: 98 >= 35 + .21x 63 >= .21x 300 >= x . This says that if the total mileage is 300 miles or less he will be within his budget.
