[tex]o \: camila \: -1 \: cap \: si \: 4 \: picioare \\
un \: paun-1 \: cap \: si \: 2 \: picioare \\
o \: rata-1 \: cap \: si \: 2 \: picioare \\
r=4p \\
c+p+r=63 \\
c+p+4p=63 \\
c+5p=63 \\
4c+2p+2r=132 | \div 2 \\
2c+p+r=66 \\
2c+p+4p=66 \\
2c+5p=66 \\ [/tex]
[tex]\left\{\begin{matrix}
c + 5p = 63 \: | \times ( - 1) \\
2c + 5p = 66\end{matrix}\right.[/tex]
[tex]\left\{\begin{matrix}
- c - 5p = - 63\\
2c + 5p = 66\end{matrix}\right.[/tex]
[tex] - c + 2c - 5c + 5c = - 63 + 66[/tex]
[tex] c = 3[/tex]
[tex]c + 5p = 63[/tex]
[tex]3 + 5p = 63[/tex]
[tex]5p = 63 - 3[/tex]
[tex]5p = 60 \: | \div 5[/tex]
[tex]p = 12[/tex]
[tex]r = 4p[/tex]
[tex]r = 4 \times 12[/tex]
[tex]r = 48[/tex]