Exams › IBPS PO › Quantitative Aptitude
While calculating the average marks of 60 students, the two digits of the original marks of a student are written in reverse order, thereby increasing the average by 0.6. Find the difference between the two digits of the student’s marks.
- 9
- 4
- 5
- 6
Correct answer: 4
Solution
An increase of 0.6 in the average of 60 students means the total marks increased by 36. For a two-digit number, reversing the digits changes the number by 9 times the difference of the digits. So, 9d = 36, giving d = 4.
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