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Students of a particular class are standing in a line. If a student's serial number is twenty-three from the start of the line in that class of fifty-one, then what is her serial number from the last student in the line?

Students of a particular class are standing in a line. If a student's serial number is twenty-three from the start of the line in that class of fifty-one, then what is her serial number from the last student in the line? Correct Answer Twenty-nine

The logic followed here is:

If a student's serial number is twenty-three from the start of the line in that class of fifty-one, then 

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The number of students after the student = 51 - 23 = 28

Here, her serial number from the last student in the line is 28 + 1 = 29th.

Hence, "Twenty-nine" is the correct answer.

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