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b - a = 3
2b = 16
b = 8
b = 8
a + b = 13
b = 8
a = 5
Odp; Ta liczba to 58
y - liczba jedności
x + y = 13
y-3 = x
y - 3 + y = 13
2y - 3 = 13
2y = 13 + 3
2y = 16 | :2
y = 8
x = 8-3
x = 5
Ta dwucyfrowa liczba to 58.