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The mass of a box measured by a grocer's...

The mass of a box measured by a grocer's balance is 2.3kg.Two gold pieces of masses 20.15 g and 20.17 g are added to the box .What is :
the difference in the masses of the pieces to correct significant figures ?

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Difference in the masses of the pieces=20.17 g-20.15g=0.02g
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