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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Analytical Reasoning
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Q)

The length of a rectangular field is thrice its breadth. If the cost of cultivating the field at Rs. 367.20 per square meter is Rs. 27,540, then what is the perimeter of the rectangle?


( A ) 47
( B ) 40
( C ) 39
( D ) 52

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A)
Answer is 40 Cost is 367.20 per square Total cost is 27540 Rs Area = 27540/367.20 =75 m square Ratio of length and breadth l:b= 1:3 Area 1x*3x = 75 3x^2=75 x^2=25 x=5 Perimeter = 2(1x+3x) = 8x =40meters
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