A typist starts to type the serial numbers of candidates in a list, upto 500. Minimum how many times does he need to press the keys of numerals only?
Question
A typist starts to type the serial numbers of candidates in a list, upto 500. Minimum how many times does he need to press the keys of numerals only?
Solution
To solve this problem, we need to consider the number of digits in each number from 1 to 500.
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Numbers from 1 to 9: There are 9 numbers, each with 1 digit. So, 9 * 1 = 9 key presses.
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Numbers from 10 to 99: There are 90 numbers, each with 2 digits. So, 90 * 2 = 180 key presses.
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Numbers from 100 to 499: There are 400 numbers, each with 3 digits. So, 400 * 3 = 1200 key presses.
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Number 500: This number has 3 digits. So, 3 key presses.
Adding all these up, the typist needs to press the keys of numerals 9 + 180 + 1200 + 3 = 1392 times.
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