Interview Maths Puzzle Category

There is an odometer in a bike and it is broken in a way whenever there supposed to be value 4 in one of the 5 digits in odometer it skips that and shows 5. It is not able to display the digit 4. For example, if the odometer is at reading 32363 KM then next reading it will show is 32365 and not 32364 or if the odometer shows 39999 then next reading it will show is 5000 instead 4000. So if odometer shows the current reading 56287 then what is its actual reading?

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Interview Other Question

Hello I attend the interview on Caterpillar & i gotta question like this , I need to find the minimum percentage number, For ex
18% of 100 = 18
18% of 50 = 9
18% of 25 = 4.5
See here 9 is the least natural number , because 4.5 is the decimal , so i won't need that. I need a formula to calculate this , Can anyone help me to solve this ?
A bus run at 100 km/hr top speed. It can carry a maximum of 6 persons. If speed of bus decreases in fixed proportion with increase in number of person, find speed when three person are traveling in bus.