Venn diagram Q8 brothers and sisters - GCSE maths Grade 7

Download the venn diagram worksheets here:

This video is all about venn diagrams and forms part of the playlist by the same name.
The question is aimed at around Grade 7 GCSE mathematics:

"Out of 50 people surveyed:
30 have a brother
25 have a sister
6 have neither a brother or a sister
a) Use this information to complete the venn diagram
b) Given that the person selected has a brother, find the probability they also have a sister.


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[danilelun]

But you have something that I would call a flaw, I did the same calculations as you did for my 20 students, 11 brothers, 9 sisters and 6 neither, it came out to have been 18 students, 2 off. I'm not trying to be mean or anything but that's what happened