Question

Calculati suma numerelor care impartite la 8 dau catul 5.

Answer 1

x:8=5 rest r=>x=8*5+r, unde r<8

x=8x5+0

x=8x5+1

x=8x5+2

x=8x5+3

x=8x5+4

x=8x5+5

x=8x5+6

x=8x5+7

Bafta!

Answer 2

$\it n:8=5\ rest\ r \Rightarrow n=8\cdot5+r \Rightarrow n=40+r,\ \ unde\ \ r < 8\\ \\ n\in\{40,\ \ 41,\ \ 42,\ \ 43,\ \ 44,\ \ 45,\ \ 46,\ \ 47\}$