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Geometry of planting grid — compute garden length: Use rows, columns, spacing, and side margins. Trees are planted in 10 rows and 12 columns; spacing between adjacent trees = 2 m. A clear margin of 1 m is left on all four sides from the boundary. Find the <em>length</em> of the rectangular garden. Choose the correct length (in metres).

Difficulty: Easy

20 m
22 m
24 m
26 m

Correct Answer: 24 m

Explanation:

Concept/Approach
The span along a direction with n trees at spacing s is (n − 1) × s. With a border margin m on both ends, total outer dimension is (n − 1)s + 2m.

Compute length (take 12 columns along length)
Length = (12 − 1) × 2 + 2 × 1 = 11 × 2 + 2 = 22 + 2 = 24 m

Final Answer
24 m

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