Question

A very crowded street in t nagar contains 100 buildings . The buildings are numbered from 1 to 100. How many 9s are used by the

Answer 1

Answer:

20 9s are there as

9 19 29 39 49 59 69 79 89 91 92 93 94 95 96 97 98 99 90

Answer 2

Given:

A crowded street in T Nagar contains 100 buildings which are numbered from 1 to 100.

To Find:

The total number of times the digit 9 has been repeated in the process of numbering is?

Solution:

The given problem can be solved using simple mathematical operations.

1. The buildings are numbered from 1 to 100.

2. The digit 9 occurs in the following numbers,

=> 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99.

3. The total number of times 9 has been repeated is to count the total numbers present above which is 19.

4. Hence, digit 9 has been repeated a total of 19 times.

Therefore, a total of 19 9s are present.