A drawing room is 7.5 m long 6.5 m broad and 6 m high.
Find the length of paper 2.5 dm wide to cover its walls
allowing 8 sq. m for doors :(With Drawing)
(a) 368 m
(b) 640 m
(c) 625 m
(d) 888 m
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Given,
The length of the room is = 7.5 metres
The width of the room is = 6.5 metres
The height of the room is = 7 metres
Width of the paper = 2.5 dm
To find,
The length of the paper.
Solution
First of all, we need to calculate the area of the walls by using the following mathematical formula,
= 2×(length of floor + width of floor) × height
= 2 × (7.5+6.5) × 6
= 168m²
The actual area of the walls
= Total area of wall - Area of door
= 168-8
= 160m²
= 16000 dm²
[ Term of the unit conversion 1 m²= 100dm²]
Length of the paper = 16000÷2.5 = 6400 dm = 640 m
[Term of unit conversion 1 m = 10 dm]
Hence,the length of the paper is 640 metres. (option b)
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