Percent decrease = (decrease in weight / original weight) * 100
= [ (6.5 - 3.9) / 6.5] * 100
= (2.6 / 6.5) * 100
= 0.4 * 100
= 40 % answer)
=
Its mass decreased 40%
6.5 - 3.9 = 2.6
2.6 / 6.5 = 0.4
0.4 = 40%
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