The mass of a box is $2.3 k g$ . Two marbles of masses $2.15 g$ and $12.48 g$ are added to it. The total mass of the box is recorded as :

2.3438 k g

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2.3428 k g

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2.34 k g

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2.3 k g

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Solution

The correct option is C $2.3 k g$
In addition or subtraction, the final result should retain as many decimal places as are there in the number with the least decimal places.
Mass of box = $2.3 k g$
Mass of first marble $= 0.00215 k g$
Mass of second marble $= 0.01248 k g$
The final weight thus must have only one decimal place with the weight being $2.3 k g$

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