# Formula of how many digit are used for printing the page numbers of booklet with 15 pages?

Answers: 2

## Answers

Formula of how many digit are used for printing the page numbers of booklet with 15 pages?...

21 pages

Step-by-step explanation:

21 pages will be used for printing the page numbers of a booklet with a 15 pages

ye

Step-by-step explanation:yep

1. 2 tens is 20, so how many two digit numbers are less than 20? That's just 10 - 19. So, there are 10 numbers (10, 11, 12, 13, 14, 15, 16, 17, 18, 19) that are less than 2 tens.

2. For the sum to be of two or three equal addends, the number should be divisible by either 2 or 3. This is because x + x = 2x and y+ y+ y = 3y, right?

Now for a number to be divisible by 2, it has to be even. So, the even numbers between 7 and 13 are 8, 10, and 12.

For those divisible by 3, we have 9 and 12.

Putting them together, we have 8, 9, 10 and 12, or 4 numbers.

3. If a book has 50 pages, then we can say that the page numbers are 1 to 50, right? 1-9 has 1 digit each, and 10 - 50 has 2 digits each.

Now 1-9 is 9 numbers, and 10 -50 is 41 numbers. So we just solve

9 x 1 + 41 x 2 = 9 + 82 = 91.

Hope this helps!

21 digits will be used for printing the page numbers of a booklet with 15 pages.

9 +82

91 digits are used for printing the page numbers

Hey there!!

For pages 1 through 9, there is one digit each

Which is 9 digits

From 10 to 50 there are

There are 41 numbers. 1 number = 2 digits

= 41 * 2 digit

= 82 digits

= 9 digits

= 91 digits in total

Hope it helps!