Răspuns :
Răspuns:
a + b = 70
a : b = 4 rest 10
a = 4 × b + 10
a = 4b + 10
4b + 10 + b = 70
5b + 10 = 70
5b = 70 - 10
5b = 60
b = 12
a + 12 = 70
a = 70 - 12
a = 58
Proba
58 : 12 = 4 rest 10
48
___
10
Răspuns:
A + B = 70 => A = 70 - B
A : B = 4 rest 10
=> (70 - B) : B = 4 rest 10
=> 70 - B = 4B + 10
=> -5B = -60
=> B = 12
=> A = 70 - B => A = 70 - 12 => A = 5