The sides of a rectangular field are in he ratio 3 : 4 . If the area of the field is 7500 sq. m. the cost of fencing the field @ 25 paise per metres is :
Let length = `(3x)` metres and breadth = `(4x)` metres
Then , `3x xx 4x = 7500`
`hArr 12 x^2 = 7500` `hArr x^2 = 625 hArr x= 25`
so, length = 75 m and breadth = 100 m.
perimeter = [2 (75 + 100)] = 350 m.
`:.` Cost fencing = Rs. (0,25 x 350) = Rs. 87.50.
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