Odpowiedź:
m - wiek Michaliny
a - wiek Adama
[tex]\left\{ \begin{array}{ll} m = 2a \\ m+5 = a + 5 + 3 \end{array}[/tex]
[tex]\left\{ \begin{array}{ll} m = 2a \\ m+5 = a + 8 \end{array}[/tex]
m + 5 = a + 8
2a + 5 = a + 8
a = 3
m = 2a
m = 2*3 = 6
[tex]\left\{ \begin{array}{ll} m = 6 \\ a = 3 \end{array}[/tex]
Odp. Adam ma 3 lata.