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2014-06-04T20:34:57-03:00
A) massa 200 - 40 cm volume
350 - x
200x = 40 * 350
200x = 14000
x = 14000/200
x= 70 cm de volume

b) massa 200 - 40 cm volume
x - 10

40x = 2000
x= 2000/40
x=50 g
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