Question

Determinati numerele naturale a,b si c stiind ca: a+b=90; b+c =110; a+c=100

Answer 1

a+b=90
b+c=110
a+c=100
_______(+)
2a+2b+2c=300
2(a+b+c)=300
a+b+c=300:2
a+b+c=150
90+c=150=>c=60
b+c=100
b+60=100=>b=40
a+b=110
a+40=110=>a=70