Question

a+b=156 a:b=6r9
a=?
b=?

Answer 1

a+b= 156
a:b= 6 r 9 ⇒ a= 6b+9
inlocuim in prima relatie
6b+9+b= 156
7b= 156-9
7b= 147
b=21
a= 6x21+9
a= 135
V: a+b= 135+21=156 (adevarat)

Answer 2

a+b=156
a:b= 6 rest 9
a=?
b=?
...........................................................................................................................
a:b=6 rest 9⇒a=6b+9
1b+6b+9=156
7b+9=156
7b=156-9
7b=147
b=147:7
b=21


a=21×6+9
a=126+9
a=135

Verificare:
21+135=156