Question

a+ b + c= 40
a = b+c
b cu 10 > c
a,b,c=?

Answer 1

b+c+b+c=40
2[b+c]=40
⇒b+c=20;
⇒b=10+c;
⇒2c=10⇒c=5;
⇒b=15;
⇒a=20;