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2014-11-09T16:56:49+02:00
c=15%
md=?
ms=600 g
c=
 \frac{md}{ms} *100⇒ 15 = md/600·100⇒md= \frac{c*ms}{100}= \frac{15*600}{100}  = \frac{9000}{100}=90g
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