Question

How many times the keys of a typewriter shall have to be pressed in order to write the numbers from 1 to 365 (both inclusive)? (a) 887 (b) 977 (c) 789 (d) 987​

Answer 1

Answer:

b. 977

Step-by-step explanation:

For 1 to 9 typewriter types 1 time for each number. Thus number of times typed = 9

For 10 to 99 typewriter types 2 times for each number . Thus number of times we have to type = 90 x 2 = 180

[There are 90 two digit numbers]

For 100 to 365 , typewriter types 3 times each for each number. Thus number of times typed = 366 x 3 = 798

Total number of times typed = 9 +180 +798 = 977