Respostas

2014-04-24T21:52:45-03:00
80 ______20+30+50
x ________20
100x=1600
x=1600÷100
x=16

80 ________100
y __________30
100y=2400
y=2400÷100
y=24

80 ______100
z ________50
100z=4000
z=4000÷100
z=40
1 5 1