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While calculating average marks of 60 students, the two digits of original marks of a student are written reversed and thereby average of marks is increased by 0.6 Find the difference between the two digits of marks of the student?

 

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  1. 9
  2. 4
  3. 5
  4. 6
  5. 3

Answer (Detailed Solution Below)

Option 2 : 4
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Detailed Solution

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Calculation

Let the correct number be 10x + y. Reversed = 10y + x
Difference = (10y + x) - (10x + y) = 9(y − x)
So, 9(y − x) = 36 → y − x = 4

Answer: 4

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Latest RRB Officer Scale - I Updates

Last updated on Jan 15, 2025

-> The IBPS RRB PO 2025 Exam Dates have been released on 15th January 2025.

-> As per the official notice, the Online Preliminary Examination is scheduled for 27th July 2025, 2nd and 3rd August 2025

-> The Mains Examination is scheduled for 13th September 2025.

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