Question

25 boys : 125 boys = 30 sec : ___________

Answer 1

25 : 125 = 30 : x

• We know : Product of Means  = Product of Extremes

⇒ 25 : 125 = 30 : x

⇒ 25x = 125 × 30

⇒ 25x = 3750

⇒ x = 3750/25

⇒ x = 150