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Multiple choice

The ratio of present ages of S and T is 7 : 8 respectively. Four year hence this ratio becomes 9 : 10 respectively. What is S's present age in years?

  1. 12

  2. 14

  3. 15

  4. 16

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let S=7x, T=8x. After 4 years: (7x+4)/(8x+4)=9/10. Cross-multiply: 10(7x+4)=9(8x+4). 70x+40=72x+36. 40-36=72x-70x. 4=2x, so x=2. S's present age=7x=7×2=14 years.

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