214. A dog is chasing a rabbit that is 150 feet ahead of it. It makes a leap of 9 feet every time the rabbit jumps 7 feet. How many jumps must the dog make to catch the rabbit?

## Herbert's Problem.
214. With each jump, the dog gains 2 feet, therefore, the entire distance of 150 feet will be covered in 75 jumps.

Herbert (died 1003), bishop of Reims, later Pope Sylvester II, author of two arithmetical treatises ("Calculations with the Abacus" and "On the Division of Numbers").