In each of the following questions a question is asked followed by three statements.You have to study the questions and all the given three statements and all the statements and decide whether any information provided in the statement are redundant and can be dispensed with while answering the questions ?
Length = 5 m , Breadth = 3 m and Height = 8 m
To find the cost of painting the walls of the room, we should know the cost of painting and the area of door and window.
Area of 4 walls (Curved Surface Area of cuboid) = $2h(l+b)$
= $(2 \times 8)(5+3) = 16 \times 8 = 128$ $m^2$
From I & II : Cost = Rs 25 per square meter
Area of window = $2.25$ $m^2$
and Area of door = $2 \times 2.25 = 4.5$ $m^2$
Thus, area to be painted = $128 - 2.25 - 4.5 = 121.25$ $m^2$
$\therefore$ Cost of painting 4 walls = $25 \times 121.25 = Rs$ $3031.25$
Thus, statement III is redundant.
=> Ans - (C)
Length = 5 m , Breadth = 3 m and Height = 8 m
To find the cost of painting the walls of the room, we should know the cost of painting and the area of door and window.
Area of 4 walls (Curved Surface Area of cuboid) = $2h(l+b)$
= $(2 \times 8)(5+3) = 16 \times 8 = 128$ $m^2$
From I & II : Cost = Rs 25 per square meter
Area of window = $2.25$ $m^2$
and Area of door = $2 \times 2.25 = 4.5$ $m^2$
Thus, area to be painted = $128 - 2.25 - 4.5 = 121.25$ $m^2$
$\therefore$ Cost of painting 4 walls = $25 \times 121.25 = Rs$ $3031.25$
Thus, statement III is redundant.
=> Ans - (C)