If the length and breadth of a room are $15 m$ and $10 m$ respectively, then
Length : Perimeter $=$ ________ $[1 : 5 / 3 : 10]$

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Solution

Given that,
Length of the room $= 15 m$
Breadth of the room $= 10 m$
Perimeter of the room $= 2 (15 + 10) = 50 m$
Now, ratio length to the perimeter of the room $= 15 : 50$
Lowest form of $15 : 50 = \frac{15}{50} = \frac{3}{10} = 3 : 10$ ( Divide both $15$ and $50$ by their HCF $5$ )
Hence, Length : Perimeter $=$ $3 : 10$

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