If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?
Answer
Answer (as printed):
Explanation
Let the required number of hours be x. Then, Less men, More hours (Indirect Proportion) 36 × 25 ∴ 15 : 36 : : 25 : x ⇔ (15 × x) = (36 × 25) ⇔ x = = 60. 15 Hence, 15 men can do it in 60 hours.
Explanation as extracted from the printed page; notation may be imperfect.