When i was 14 years old, my father was 3 times my age. now he is twice my age. how old am i?

Let f be the father's age and his child's age be c.

As the father is 42  14 = 28 years older than the child, f = c + 28.

At the moment f = 2c, hence 2c = c + 28, and so c = 28. That is, the father's child is now 28 years old.

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