Brothers and sisters

There are 35 children in the class, 23 of them have a brother, and 27 of them have a sister. How many children have both a brother and a sister when there are 5 children in the class who have no brother or sister?

Correct result:

x =  20

Solution:

30=x+27−x+23−x  x=23+27−(35−5)=20

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