Question

a+b egal 100
b+c egal 110
a+c egal 90

Answer 1

a+b=100=>b=100-a
inlocuim  a doua:100-a+c=110=>c-a=110-100=10=>c=10+a
inlocuim in ultima :a+10+a=90=>2a=80+>a=80:2=40
 a=40
a+b=100=>40+b=100=>b=100-40=60
a+c=90=>40+c=90=>c=90-40=50

verificare:a+b=100=>40+60=100
              b+c=110=>60+50=110
               a+c=90=>40+50=90

Answer 2

2a + 2b + 2c= 100+ 110 + 90
2a + 2b + 2c=300
a + b + c= 150
100 + c = 150
c=50
a=90-50
a=40
b= 60