Răspuns :
a + b = 30
a / b = 6 rest 2 => a = 6 * b + 2
a __/__/__/__/__/__/+2_/
b __/
30 - 2 = 28
28 / 7 = 4
b = 4
a = 6 * 4 + 2
a = 26
a / b = 6 rest 2 => a = 6 * b + 2
a __/__/__/__/__/__/+2_/
b __/
30 - 2 = 28
28 / 7 = 4
b = 4
a = 6 * 4 + 2
a = 26
a= 6xb + 2
6b+2+b=30
7b+2=30
7b=28
b=28:7
b=4
a+4=30
a=30-4
a=26