Basket Of Potatoes
Answer :

Multiply together the number of potatoes, the number less one, and twice the number less one, then divide by 3.
Thus 50, 49, and 99 multiplied together make 242,550, which, divided by 3, gives us 80,850 yards as the correct answer.
The boy would thus have to travel 45 miles and fifteen-sixteenths—a nice little recreation after a day's work.

Math Genius