A certain brand of mothballs evaporates at a rate


A certain brand of mothballs evaporates at a rate proportional to their volume (v) losing half of its volume in every four weeks.If the volume of each ball is initially 15cmand the ball becomes ineffective when its volume is 1cm3. How long will the ball be ineffective? Kind show your working.

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Mathematics: A certain brand of mothballs evaporates at a rate
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