Question

In a row of trees, one tree is fifth from either end of the row. How many trees are there in the row?

Answer 1

Compute the number of trees in the row

Since, one tree is on the fifth number when counted from either side. That means, $5$ is the middle term.

Since, only one middle term is there that means the total number of terms $n$ will be odd.

$$\begin{gathered} \frac{n+1}{2}=5 \\ \Rightarrow n+1=10 \\ \Rightarrow n=9 \end{gathered}$$

Hence, there are $9$ trees in the row.