Pupil age

I am a primary school pupil, and I spent 1/4 of my age on parents' exercise with children, 1/3 on drawing, and 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 answer:

n =  12

Step-by-step explanation:


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

1/4·n + 1/3·n + 1/6·n + 3 = n

3n = 36


n = 36/3 = 12

n = 12

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