Question

the sides of a rectangular park are in the ratio 4:3 if it's area is 1728 m² find the cost of fencing it at ruppes 30 per metre

Answer 1

ratio =4x*3x=12xsq =1728 = xsq=1728/12=144then x=12m cost =12*30=360permsq answer is 360permsq ratio area =12*4=48msq 12*3=36msq

Answer 2

Let the sides of the park be 4x and 3x
Therefore, area of the park=l×b
Therefore, 4x×3x=1728
Therefore,
${x}^{2} = 1728 \div 12 \\ x = \sqrt{144} \\ x = 12$
Therefore, lenght=48 and beadth=36
Therefore, perimeter of the park=2(48+36)
=2×84=168
Therefore, cost of fencing the park=168×30
=5040 rupees