Solve the following

Mona's father is thrice as old as mona. After 12 years he will be just twice his daughter. find their present ages.

Solution:

Let us assume that the present age of Mona is X years, then his fathers age will be 3X years.

So the equation we get from the problem:

2(X + 12) = (3X + 12)

2X + 24 = 3X + 12

2X - 3X = 12 - 24

- X = - 12

X = 12 years.

Then Mona's present age is 12 years and her father's present age is 3 x 12 = 36 years.

**Ans: 36 12 years.**

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