The specific gravity of a body is 1.86.wht will be its density? ​

Specific gravity. Specific gravity, also called relative density, ratio of the density of a substance to that of a standard substance. The usual standard of comparison for solids and liquids is water at 4 °C (39.2 °F), which has a density of 1.0 kg per litre (62.4 pounds per cubic foot).

answer:

2×3 +3×5 =6+15=21

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what is i can't understand