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Question

A body weighs 20gf in air and 18.0gf in water. The relative density of the material of body is X. Find (X-3).

A
10
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B
9
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C
7
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D
6
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Solution

The correct option is D 7
Relative density of a substance is the ratio of its density to the density of a reference substance.
relativedensityofthebody=WeightofthebodyinairLossofweightinwater.
It is given that A body weighs 20gf in air and 18.0gf in water.
Therefore, 202018=10=X
Hence, the answer X-3 = 7.

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