Respostas

2014-08-05T17:11:59-03:00
63 / 3 = 21 x 2 = 42 galinhas 
42 - 63 = 21 patos
1 2 1
2014-08-05T17:14:13-03:00
         2\3 de 63 = 63 : 3 X 2 = 42
         
         63 - 42 = 21