Question

Afla numerele a,b si c stiind ca :a+b=300,b+c=500,a+c=400.

Answer 1

$a+b+b+c+a+c=300+500+400 \\ 2(a+b+c)=1200 \\ a+b+c=1200:2=600 \\ c=600-300=300 \\ a=600-500=100 \\ b=600-400=200$