The average age of a woman and her daughter is 42 years. The ratio of their ages is 2 : 1 respectively. Find the daughter's age.

24 years
28 years
30 years
32 years

Correct Answer: 28 years

Explanation:

Let us assume the present ages of woman and her daughter be 2x and x years respectively ; then
According to question,
The average age of a woman and her daughter is 42 years
(2x + x)/2 = 42
⇒ 3x = 84
∴ x = 28
Hence, present age of her daughter = 28 years

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