Pupil age

I am a pupil of the primary school, I spent 1/4 of my age on the exercise of parents with children, 1/3 on drawing, 1/6 on flute. I did not have a ring for the first three years of my life and never went to two rings at once. How old am I?

Correct result:

n =  12

Solution:

1/4 n + 1/3 n + 1/6n + 3 = n

1/4•n + 1/3•n + 1/6•n + 3 = n

3n = 36

n = 12

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