The density of a certain oil on frying becomes 0.4 kgm(^{-3}) with the volume of 20m(^{3}). what will be its initial volume when its initial density is 0.8 kgm(^{-3}) assuming no loss of oil due to spillage?
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A.
12m3
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B.
10m3
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C.
8m3
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D.
5m3
Correct Answer: Option B
Explanation
Density (D) = (frac{mass}{volume})
(therefore Mass = Density times volume)
= (0.4 times 20 = 8kg)
The initial volume = (frac{Mass}{text{Initial density}})
= (frac{8}{0.8} = 10m^{3})