Direction: In each of the following questions, a question is asked followed by three statements. You have to study the questions and all the three statements given and decide whether any information provided in the statement(s) is/are redundant and can be dispensed with while answering the questions.
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What will be the cost of painting the four walls of a room with length, width and height 5 m, 3 m and 8 m respectively? The room has one door and one window.
A. Cost of painting per m2 is $ 25.00
B. Area of window of 2.25 m2 is half of the area of the door.
C. Area of the room is 15 m2.
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- A only
- B and C together
- A and B together
- C only
- All are required to answer the question.
Correct Option: D
As per the given above question ,
Given , Length = 5 m , Width = 3 m and Height = 8 m
From statement A , Cost of painting = $ 25 per m2
From statement B , Area of window = ( 1 / 2) x area of the door
⇒ 2.25 m2 = ( 1 / 2) x area of the door ⇒ area of the door = 4.50 m2
From statement C , Area of the room = 15 m2.
The area of four walls = 2h( l + b ) = 2 x 8 ( 5 + 3 ) = 16 x 8 = 128 m2.
∴ Cost of painting the four walls = area x Cost of painting per m2 = 128 x 25 = $ 3200
The area off our walls can be easily determined with the help of the data given in the question. Now,the area of the windows and door with the help of (B) can be subtracted in the calculated area and then multiplied with the cost given in (A).
