Question

a+b=90
b+c=21
a+c=75


a+b=70
b+c=11
a+c=65
va dau coroana

Answer 1

a+b=90
b+c=21
a+c=75
a+b+b+c+a+c=90+21+75
2(a+b+c)=186
a+b+c=93
c=93-90=3
a=93-21=72
b=93-75=18

a+b=70
b+c=11
a+c=65

a+b+b+c+a+c=70+11+65
2(a+b+c)=146
a+b+c=73
c=73-70=3
a=73-11=62
b=73-65=8