Respuesta :

So,

since the amount of boys that remain is twice the amount of girls that left:
Its, 9X2=18
18 boys
(we can assume that the amount of girls that left is equal to the amount that remains)

And since the amount of girls is = to the amount of boys,
its 18+18=36

So the original amount of students present is 36 students

Hope this helps!

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