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Determine Time by Rounding to Nearest Hour

For adding or subtracting time, we can make use of the method rounding.
 

  • If the number of minutes in the time to be added (or subtracted) is 30 or more, round the time up to the next hour.
     
  • If the number of minutes in the time to be added (or subtracted) is less than 30, round the time down to the previous hour.
     

For example: Let’s say we need to add 1 hour and 55 minutes to 5:15.

 

Here, as the number of minutes is more than 30, round 1 hour 55 minutes to 2 hours (5 extra minutes).

 

5:15 + 2 hours = 7:15

 

Since we added 5 extra minutes, we will now subtract 5 minutes.
7:15 – 5 mins = 7:10

 

So, 5:15 + 1 hour and 55 minutes = 7:10.





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The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.

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