Question

Express the odd number $31$ as the sum of three odd numbers.

Answer 1

Odd numbers are $1,3,5,7,9,11,13,15,...$ and so on.

$31$ can be expressed as sum of $21,7$ and $3$ $i.e21+7+3=31$.

There are some other odd numbers which can form $31$.

Like:

$$\begin{gathered} 5+7+19=31 \\ 7+11+13=31 \end{gathered}$$

Hence, the odd number $31$$=\left(21+7+3\right)$,$\left(5+7+19\right),\left(7+11+13\right)$ where $21,7,5,11,13,19$ and $3$ are also odd numbers.