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Area - General Aptitude

Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.
Q1:

What is the area of rectangular field?  I. The perimeter of the field is 110 metres.  II. The length is 5 metres more than the width.  III. The ratio between length and width is 6 : 5 respectively.

A I and II only

B Any two of the three

C All I, II and III

D I, and either II or III only

E None of these

ANS:B - Any two of the three

I. 2(l + b) = 110          l + b = 55. II. l = (b + 5)          l - b = 5.

III. l = 6          5l - 6b = 0.
b 5
These are three equations in l and b. We may solve them pairwise.  Any two of the three will give the answer.  Correct answer is (B).