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2015-10-02T18:08:17+05:30

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Relative density = weight in air / (weight in air - weight in water)
RD = 20/(20-18) 
RD = 10.
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2015-10-02T18:28:30+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Relative density can be written as:

RD =  \frac{weight\ in\ air}{weight\ loss\ in\ water} =\frac{weight\ in\ air}{weight\ in\ air-weight\ in\ water}

weight in air = 20g
weight in water = 18g

RD =  \frac{20}{20-18} = \frac{20}{2} =\boxed{10}
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