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Question

The weights of Rashmi and Anisha are 79.725 kg and 69.45 kg respectively. What are the number of significant digits in the difference between their weights?


A

4

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B

5

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C

3

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D

6

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Solution

The correct option is B

5


Convert the given weights to like decimals. Therefore, the given weights are 69.725 and 69.450 kg respectively.

79.725
69.450
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
10.275 kg
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Number of significant digits in the result = 5


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