Rings groups

27 pupils attend some group; dance group attends 14 pupils, 21 pupils sporty group and dramatic group 16 pupils. Dance and sporting attend 9 pupils, dance and drama 6 pupil, sporty and dramatic 11 pupils. How many pupils attend all three groups?


o =  -1



a+b+c+o+x+y+z = 27
a+o+x+y = 14
b+o+x+z = 21
c+o+y+z = 16
x = 9
y = 6
z = 11

a = 0
b = 2
c = 0
o = -1
x = 9
y = 6
z = 11

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