Question

Kristie is arranging books in a library. She places an English book in the $8^{th}$ position from the left end of a row and a mathematics book in the ${12}^{th}$ position from the right end.
If the mathematics book is $6^{th}$ to the left of the English book, then find the total number of books in the row.

• A. 12
• B. 13
• C. 20
• D. 10

Answer 1

The correct option is B 13

The English book is placed in the $8^{th}$ position from the left end.
The mathematics book is placed in the ${12}^{th}$ position from the right end.

We know that the mathematics book is $6^{th}$ to the left of the English book.

Position of Mathematics book from left end = Position of English book – 6
= 8 – 6
$=2^{nd}$

Thus, the mathematics book will be placed $2^{nd}$ from the left end and ${12}^{th}$ from the right end.

The placement will be:

So, there are 13 books in the row.