a+x+100+y+b+c=680−40a+x+100=390b+y+100=350c+x+y+50=140 Then
a+x=290b+y=250c+x+y=90290+100+250+c=640
c=0x+y=90a+b=290+250−90a+x=290 a) Only to one university
a+b+c=450+0=450
b) Exactly to two university
x+y+50=90+50=140
c) Both UNN and UI
50+y=undefined
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