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a+b=1209
b:a=15rest9
a=?
b=?


Răspuns :

a+b=1209
a:b=15r9=>a=15b+9
15b+9+b=1209
16b=1209-9
b=1200:16
b=75
a=15x75+9=1134
b:a=15 rest 9
Atunci:
b=15a+9
a+b=1209
Îl inlocuim pe b:

a+15a+9=1209
16a=1209-9
16a=1200
a=1200:16
a=75

b=15a+9=15×75+9=1125+9=1134