Question

determina numarul abc, in care a, b,c, sunt cifrele acestui numar, suma lor este 22, a+b=13 si b+c=15.

Answer 1

a +b+c= 22
a+b=13
b+c=15
a+15=22 =>a=7
7+b=13 => b=6
6+c=15 => c=9
ABC = 769

Answer 2

a+b+c=22
a+b=13⇒b=13-a
b+c=15⇒c=15-b=15-(13-a)=15-13+a=2+a
a+13-a+2+a=22
a=22-15
a=7
b=13-7=6
c=15-6=9
abc=769