Respostas

2014-02-23T16:49:48-03:00
10 = x% de 40
logo:
10 = (x ÷ 100) × 40
x ÷ 100 = 10 ÷ 40
x ÷ 100 = 0,25
x = 0,25 × 100
x = 25%
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