Question

15xy in baza 10 divizibil cu 18

Answer 1

y div cu 2 si 1+5+x+y=6+x+y div cu 9
daca y=0, x=3
daca y=2, x=1
daca y=4, x=8
daca y=6, x=6
daca y=8, x=4

O zi buna!

Answer 2

y divizibil cu 2 si 1+5+x+y=6+x+y divizibil cu 9 y=0, x=3 y=2, x=1 y=4, x=8 y=6, x=6 y=8, x=4