Question

Trees are planted at intervals of 5 m along side of a 140 m straight path. The first tree is planted at the start of the path and the last tree is planted at the end of the path. Calculate the total number of trees planted.

Answer 1

Solution :

Distance between first tree and last tree is 140m .

And distance between each tree (d) = 5 m

let's solve for number of trees (n) :

$\hookrightarrow \: (n - 1)d = 140$

$\hookrightarrow \: (n - 1)5 = 140$

$\hookrightarrow \: n - 1 = \dfrac{140}{5}$

$\hookrightarrow \: n = 28 + 1$

$\hookrightarrow \: n = 29$

hence, total number of trees = 29.