Question

Daca a+b=50 , a+c=151 , atunci c-b=? Dau coroana!

Answer 1

a+c=151
a+b=50
c-b=151-50
c-b=101

Answer 2

$a+b=50 \\ a+c=151 \\ (a+c)-(a+b)=151-50 \\ c-b=101$