Aptitude - Area - Discussion

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"Do not wait for leaders; do it alone, person to person."

- Mother Teresa

Directions to Solve

Each of these questions is followed by three statements. You have to study the question and all the three statements given to decide whether any information provided in the statement(s) is redundant and can be dispensed with while answering the given question.

What is the cost painting the two adjacent walls of a hall at Rs. 5 per m² 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.

[A].	I only
[B].	II only
[C].	III only
[D].	Either I or III
[E].	All I, II and III are required.

Answer: Option B

Explanation:

From II, let l = 4x, b = 6x and h = 5x.

Then, area of the hall = (24x²) m².

From I. Area of the hall = 24 m².

From II and I, we get 24x² = 24 x = 1.

l = 4 m, b = 6 and h = 5 m.

Thus, area of two adjacent walls = [(l x h) + (b x h)] m² 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).

Habib said: (Fri, Feb 11, 2011 11:15:54 AM)

Can anyone explain?

Henderson said: (Tue, Jun 14, 2011 04:00:14 AM)

Why (C) ?

Ajay said: (Thu, Sep 29, 2011 04:31:06 PM)

Please explain why we take (C) OPTION.

Balaji said: (Sat, Dec 17, 2011 01:40:25 PM)

Can anyone explain this?

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Aptitude - Area - Discussion

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