Discussion :: Area

What is the cost painting the two adjacent walls of a hall at Rs. 5 per m^{2} which has no windows or doors?
I. The area of the hall is 24 sq. m.
II .The breadth, length and height of the hall are in the ratio of 4 : 6 : 5 respectively.
III. Area of one wall is 30 sq. m.
Answer : Option C
Explanation :
From II, let l = 4x, b = 6x and h = 5x.
Then, area of the hall = (24x^{2}) m^{2}.
From I. Area of the hall = 24 m^{2}.
From II and I, we get 24x^{2} = 24 x = 1.
l = 4 m, b = 6 and h = 5 m.
Thus, area of two adjacent walls = [(l x h) + (b x h)] m^{2} can be found out and so the cost of painting two adjacent walls may be found out.
Thus, III is redundant.
Correct answer is (C).
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