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The length, breadth and height of a room are $5 m, 4 m$ and $3 m$ respectively. Find the cost of washing the walls of the room and ceiling at the rate of $R s .7.50 per m 2$ .

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565

555

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answer is C.

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Detailed Solution

Given,
Length of the room,

l = 5 m

Breadth of the room,

b = 4 m

Height of the room,

h = 3 m

Area to be whitewashed will not include the floor.
Therefore, Area to be whitewashed = Area of four walls + Area of Ceiling
∴ Area to be whitewashed =

2 h l + b + l b

⇒ Area to be whitewashed =

2 × 3 5 + 4 + 5 × 4

⇒ Area to be whitewashed =

6 × 9 + 20

⇒ Area to be whitewashed =

74 m 2

Cost of white washing of

1 m 2 = R s .7.50

∴Total cost of white washing=

R s .7.50 × 74

⇒Total cost of white washing=

R s .555

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The length, breadth and height of a room are 5m,4m and 3m respectively. Find the cost of washing the walls of the room and ceiling at the rate of Rs.7.50 per m 2 .

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The length, breadth and height of a room are $5 m, 4 m$ and $3 m$ respectively. Find the cost of washing the walls of the room and ceiling at the rate of $R s .7.50 per m 2$ .