The average of the ages of Sonu, Hari and Govind is 30 years. If their ages are in the ratio of 4 : 5 : 6, respectively, then the difference between the ages of Sonu and Govind is:
Answer & explanation
Correct answer: option 4
Sum of ages of Sonu, Hari and Govind = 30 × 3 = 90 years
Ratio of ages of Sonu, Hari and Govind = 4 : 5 : 6
ATQ,
4R + 5R + 6R = 90
15R = 90
1R = 6
Difference b/w age of Sonu & Govind = 2R = 2 × 6 = 12 years