Question

daca nr 8 ii adunam un nr marit de 7 ori si imoartim rezultatulla 9 obtinem catul si restul 5.aflati nr?

Answer 1

8 + ax7 : 9= 5 rest 5
8 +7a = 9 x 5 +5
8 + 7a = 50
7a = 50 - 8
7a = 42
a = 42 : 7
a = 6

Answer 2

notam cu x nr. de aflat
(8+7x) : 9 = 5 rest 5
8+7x = 9*5+5
8+7x = 50
7x = 50-8
7x = 42
x = 42 : 7
x = 6
Verificare:
(8+7*6) : 9 = 5 rest 5