In the classroom

There are 30 boys and a few girls in the class. In the six months, 28 boys and all girls benefited, which was 95% of all pupils. How many pupils are there in the classroom?

Correct result:

x =  40


 28+d=0.95 (30+d)  0.05d=0.5  d=10  x=30+d=30+10=40 \ \\ 28+d=0.95 \cdot \ (30+d) \ \\ \ \\ 0.05d=0.5 \ \\ \ \\ d=10 \ \\ \ \\ x=30+d=30+10=40

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