Question

un fermier vindea pui si iepuri ;20 capete si 68 picioare. citi pui si iepuri vindea fermierul

Answer 1

   [tex] \left \{ {{2a+4b=68|*1=\ \textgreater \ 2a+4b=68} \atop {a+b=20|*(-2)=\ \textgreater \ -2a-2b=-40} \right.\\ 2b=28=\ \textgreater \ b=28:2=\ \textgreater \ b=14\\ a+14=20=\ \textgreater \ a=20-14=\ \textgreater \ a=6\\ Proba:14+6=20\\ 2*6+4*14=68\\ 12+56=68\\ 68=68 [/tex]

Answer 2

presupunem ca toti sunt iepuri
20*4=80
80-68=12
12/2=6 pui
20-6=14 iepuri