Respostas

2014-06-04T18:49:45-03:00
Vamos chamar este numero de x e y.
x+y=40
y+10=x
y+10+y=40
2y=40-10
2y=30
y=30/2
y=15

y+10=x
15+10=x
x=25
2014-06-04T18:50:06-03:00