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A mother is 4 times as old as her daughter and the father is 5 times as old as his daughter. The sum of mother’s and father's age is 135 years. What is the age of daughter ?
1. 10 years
2. 15 years
3. 20 years
4. 25 years

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Correct Answer - Option 2 : 15 years

Let the age of daughter be x then,

Age of mother = 4x and,

Age of father = 5x

According to question,

Age of Father + Age of mother = 135

5x +4x = 135

9x = 135

x = 135/9

x = 15

So, Age of daughter = x = 15 years.

Hence, option 2 is the correct answer.

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