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# There are eight mango trees in a straight line. The distance between each mango tree with other is 3 metres. What is the distance between first tree and eighth tree?

( A ) 30
( B ) 21
( C ) 27
( D ) 24

Number of intervals between $1^{st}$ and $8^{th}$ tree = 8 - 1 = 7
\begin{align*}\text{Distance between 1st and 8th tree} & = 7 \times 3 \\ &=21m\end{align*}