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The side of a square plot is 15 cm. A path of width 3 cm runs around outside it. The side of the outer
square is

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18 cm

12 cm

16.5 cm

21 cm

answer is D.

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Detailed Solution

Side of a square plot

$a = 15 cm$

A path of width 3 cm runs around outside it

Side of the outer square with path

$= 15 + 6 = 21 c m$

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