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Sagot :
x - teachers
y - boys
z - girls
[tex]x+y+z=394\\ x+y=189\\ x+z=217\\\\ x+y+z=394\\ y=189-x\\ z=217-x\\\\ x+189-x+217-x=394\\ -x=-12\\ x=12\\\\ y=189-12\\ y=177\\\\ z=217-12\\ z=205[/tex]
y - boys
z - girls
[tex]x+y+z=394\\ x+y=189\\ x+z=217\\\\ x+y+z=394\\ y=189-x\\ z=217-x\\\\ x+189-x+217-x=394\\ -x=-12\\ x=12\\\\ y=189-12\\ y=177\\\\ z=217-12\\ z=205[/tex]

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