A mothball is in the shape of a sphere and starts with


Question: A mothball is in the shape of a sphere and starts with radius 1 cm. The material in the mothball evaporates at a rate proportional to the surface area. After one month, the radius is 0.5 cm. How many months (from the start) is it before the radius is 0.2 cm?

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Mathematics: A mothball is in the shape of a sphere and starts with
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