Question

Afla numarul a b c d e, stiind ca: b-a=1, b+c=12, c-d=4, e-d=6,18-e=9.

Answer 1

18-e=9 , deci e=18-9, e=9.

e-d=6 <-> 9-d=6 <-> d=3

c-d=4 <-> c-3=4 <-> c=7

b+c=12 <-> b+7=12 <-> b=12-7=5

b-a=1 <-> 5-a=1 <-> a=4