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?

Correct result:

o =  -1

Solution:

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

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

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