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प्रश्न
The cost of enclosing a rectangular garden with a fence all around, at the rate of 75 paise per metre, is Rs. 300. If the length of the garden is 120 metres, find the area of the field in square metres.
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उत्तर
The perimeter of the garden
s = `300/0.75` = 400 sq .m
Again, the length of the garden is given to be 120 m. hence breadth of the garden b is given by
2( l + b ) = S
2 ( 120 + b ) = 400
b = 80m
Hence area of the field
A = 120 x 80
= 9600 sq . m
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