Discussion
In a garden, there are 10 rows and 12 columns of mango trees. The distance between the two trees is 2 metres and a distance of one metre is left from all sides of the boundary of the garden. The length of the garden is
Answer: C
Correct answer: 24 m
The length runs along the 12 columns, so there are 11 gaps of 2 metres between the outer trees, plus 1 metre of margin at each end: \[ 11\times2 + 1 + 1 = 24\ \mathrm{m}. \] The step to be careful with is that 12 trees make 11 gaps, not 12 - using 12 gives 26, which is offered here.
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