1o children stand in a row to perform a drill. How many children can be there to perform the drill? Give a rule to caculate this (use r for the number of rows)

How to do this.

Dear Student,

Please find below the solution to the asked query:
$$\begin{gathered} \mathrm{In} 1 \mathrm{row} \mathrm{number} \mathrm{of} \mathrm{children} \mathrm{stand}=10 \\ \mathrm{number} \mathrm{of} \mathrm{rows}=\mathrm{r} \\ \mathrm{So} \\ \mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{students} =\mathrm{number} \mathrm{of} \mathrm{rows}\times \mathrm{number} \mathrm{of} \mathrm{children} \mathrm{stand} \mathrm{in} \mathrm{one} \mathrm{row} \\ \mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{students} =\mathrm{r}\times 10=10\mathrm{r} \left(\mathrm{Answer}\right) \end{gathered}$$

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