A room is 6 m long, 5 m broad and 4 m height. If all its walls are to be covered with paper 50 cm wide, the length of the paper is

120 m

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88 m

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440 m

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176 m

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Solution

The correct option is D 176 m
R.E.F image
Area of cuboid (room) $= 2 b h + 2 h l$
$= (2 \times 20) + (2 \times 24)$
$= 88 m^{2}$
Area of paper $= l b$
$= l \times 0.5 m$
$= 0.5 l m^{2}$
Area of cuboid $=$ Area of paper
$88 = 0.5 l \Rightarrow l = 176 m$

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A room is 6 m long, 5 m broad and 4 m height. If all its walls are to be covered with paper 50 cm wide, the length of the paper is

The correct option is D 176 mR.E.F image Area of cuboid (room) =2bh+2hl=(2×20)+(2×24)=88m2Area of paper =lb=l×0.5m=0.5lm2Area of cuboid = Area of paper 88=0.5l⇒l=176m

The correct option is D 176 m
R.E.F image
Area of cuboid (room) $= 2 b h + 2 h l$
$= (2 \times 20) + (2 \times 24)$
$= 88 m^{2}$
Area of paper $= l b$
$= l \times 0.5 m$
$= 0.5 l m^{2}$
Area of cuboid $=$ Area of paper
$88 = 0.5 l \Rightarrow l = 176 m$