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A necless weighing 50 g in air, but it w...

A necless weighing 50 g in air, but it weight 46 g in water. Assume copper is mixed with gold to prepare the neckless. Find how much copper is present in it. (Specific gravity of gold is 20 and that of copper is 10 )

A

`m=25 g`

B

`m=30 g`

C

`m=35 g`

D

`m=20 g`

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