Question

A book has 160 pages. How many page numbers contain the digit 'O?​

Answer 1

A book has 160 pages. So, 25 page numbers contain the digit '0' (zero).

Step-by-step explanation:

• Let us see which page numbers have '0' in it. If we see pages one by one, the required page numbers are:

• 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 120, 130, 140, 150 and 160.

• So, there are 25 page numbers with the digit '0'.

Note:

We can check the page numbers as multiples of 10: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 140, 150 and 160.

We must not forget about the numbers: 101, 102, 103, 104, 105, 106, 107, 108 and 109.

Answer 2

Answer:

There are 25 page numbers with the digit '0'.

Step-by-step explanation:

• In context to the given question, We have to find the number of pages contains zero "0"
• If we take a glance at the pages;

⇒Let us see which page numbers have '0' in it.

⇒ All the 16 number which are divisible by has "0" in it = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 and 160.

⇒ And, the 9 number between 100 and 110 =  101, 102, 103, 104, 105, 106, 107, 108, 109,

⇒So, The total number of pages with "0" digit = 16 + 9 = 25

Therefore, there are 25 page numbers with the digit '0'.