Question

Chintu used a pencil of length 12 cm to measure his friend Salman's height. Salman's height is equal to the length of 13 pencils, what is Salman's height in metres?

Answer 1

Hint: For solving this problem, we have the length of pencil as 12 cm. The total height of Salman is 13 times the length of one pencil. After obtaining the height in centimetre we convert it into metres by dividing it with 100. In this way, we can obtain the height of Salman in metres.

Complete step-by-step solution -
According to the problem statement, we are given the length of one pencil as 12 cm. We are required to evaluate the height of Chintu's friend Salman.
Also, it is stated that the height of Salman is equal to the length of 13 pencils.
So, the height of Salman is 13 times the length of one pencil.
$\begin{align}
  & H=13\times 12cm \\
 & H=156cm \\
\end{align}$
The above obtained height is in centimetre. To convert it into metres we divide the height by 100. So, Salman’s height in meters is $\dfrac{156}{100}=1.56m$.

Note: Students must be very careful while calculating the height because the length of the pencil is given in centimetre. So, initially the height is obtained in centimetre. It must be converted into metres as the question demands. This is a common mistake which must be avoided.