Multiple choice

S is younger than R by 7 years. If their ages are in the respective ratio of 7 : 9, how old is S ?

  1. 16 years

  2. 18 years

  3. 28 years

  4. 24.5 years

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let the ages be 7x and 9x. Since S is younger than R by 7 years, 9x - 7x = 7, which means 2x = 7 or x = 3.5. S's age is 7 * 3.5 = 24.5 years.

AI explanation

Let the present age of S be 7x years and the present age of R be 9x years. The difference in their ages is 9x - 7x = 2x, which equals 7 years. Solving for x gives x = 3.5, so the age of S is 7 times 3.5, which is 24.5 years.

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