If 12 oxen eat up \(3\frac{1}{3}\) acres of meadow in 4 weeks and 21 oxen eat up 10 acres of exactly similar meadow in 9 weeks, how many oxen shall eat up 36 acres in 18 weeks? (Hint: The grass continues to grow.)
Arithmetica Universalis (Universal Arithmetick), Isaac Newton, 1707
Click here to reveal the answer