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The ratio of the present age of Rahul and Rashmi is 2 : 1. The ratio of their age after 30 years will be 7 : 6. What is the present age of Rahul ?
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- 6 years
- 10 years
- 12 years
- 20 years
Correct Option: C
Let the present age of Rahul and Rashmi be 2x and x years respectively.
After 30 years,
| = | ||
| x + 30 | 6 |
⇒ 12 x +180 = 7x + 210
⇒ 12 x –7x = 210–180
| ⇒ 5 x = 30 ⇒ x = | = 6 | |
| 5 |
∴ Rahul’s present age
= 2x = 2×6 = 12 years
