Question

A book is $7.5$ inches long. How many centimeters long is the book?

Answer 1

Hint: As we have given the length of the book in inches and we have to convert it into centimeters. To convert the units we will use the relation between inches and centimeters which is given as $1\text{ inch = 2}\text{.54 cm}$. Then we will multiply $7.5$ by $2.54$ to get the desired answer.

Complete step-by-step solution:
We have been given that a book is $7.5$ inches long.
We have to find out how many centimeters long is in the book.
Now, the given length of the book is in inches and we have to convert it into centimeters.
We know that an inch contains $2.54$ cm, i.e. $1\text{ inch = 2}\text{.54 cm}$
Now, we have to calculate how many centimeters $7.5$ inches contain.
So we calculate it by multiplying the $7.5$ by $2.54$. Then we will get
$\Rightarrow 7.5\times 2.54$
Now, simplifying the above obtained equation we will get
$\Rightarrow 19.05$cm
So, we get the length of the book as $19.05$ cm.

Note: As the both given units are units of the length. So, to solve these types of questions students must have the knowledge of basics of inches and centimeters and relation between the units. The given question is simple so avoid any calculation mistake else it gives the incorrect answer. Students may confuse whether to divide 7.5 by 2.54 or to multiply. Dividing the value instead of multiplying gives the incorrect answer.