An army regime is marching in a parade.There are 21 soldiers in a row. What is the total number of soldiers for a given number of rows? ( Take r as the number of rows in the form of variable )

 Given:

An army regime is marching in a parade.

There are 21 soldiers in a row. 

To do:

We have to find the total number of soldiers for a given number of rows

Solution:

Let the number of rows be $r$.

Number of soldiers in a row $=21$. 

Total number of soldiers $=$ Number of soldiers in a row $\times$ Number of rows.

$=21\times r$

$=21r$.

Therefore, the required rule for number of soldiers is $21r$.

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Updated on: 10-Oct-2022

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