Respostas

2014-07-22T23:52:31-03:00
10 , pois 10 ÷ 5 = 2 
10 + 2 é 12

Reposta : 10
2014-07-22T23:53:08-03:00
X + x/5 =12 x + 0.2x = 12 1.2x 12 x = 12/1.2 x= 10