B

Bijay Kumar • 5.24K Points
Tutor III Math

Q. The ages of Samir and Saurabh are in the ratio of 8 : 15 respectively . After 9 years the ratio of their ages will be 11 : 18. What is the difference between their ages in years?

  • (A) 20 years
  • (B) 21 years
  • (C) 22 years
  • (D) 24 years
  • Correct Answer - Option(B)
  • Views: 229
  • Filed under category Math
Explanation by: Bijay Kumar
Let the present ages of Samir and Saurabh are 8a and 15a years respectively ; .
After 9 years the ages of Samir and Saurabh will be 8a + 9 and 15a + 9.
According to question,
After 9 years the ratio of their ages will be 11 : 18, then
(8a + 9)/ = 11/18
⇒ (8x + 9) x 18 = 11 x (15a + 9)
⇒ 144a + 162 = 165a + 99
⇒ 21a = 63
∴ a = 3
Hence, difference of their ages = 15a - 8a = 7a = 7 x 3 = 21 years

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