10 years ago, Chandravati's mother was 4 times older than

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10 years ago, Chandravati's mother was 4 times older than her daughter. After 10 years, the mother will be twice older than the daughter. The present age of Chandravati is ?

1. 5 years
2. 10 years
3. 20 years
4. 30 years

Correct Option: C

Let Chandravati's age 10 years ago be x years.
∴ mothere's age 10 years ago = 4x years
From Question 2(x + 20) = (4x + 20)
⇒ x = 10
∴ Present age of Chandravati = (x + 10) = 20 years