When Pythagoras asked how many students attended the school, he said: "Half of the students studying mathematics, 1/4 music, seventh silent, and there are three girls at school." How many students had Pythagoras at school?

Correct answer:

n =  28

Step-by-step explanation:

2n+4n+7n+3=n  n/2+n/4+n/7+3=n  3n=84  n=384=28  n=28

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