Question

the sides of a rectangle are in the ratio 4:3 if the area is 1728 sqm, find the cost of fencing it at the rate of Rs.2.50/m

Answer 1

let the ratio of sides of rectangle be x
4x, 3x
4x*3x=1728
12x^2=1728
x^2=1728/12
x^2=144
x^2=12^2
x=12
3x=3*12=36
4x=4*12=48
perimeter of rectangle=2(l+b)
=2(36+48)
=188m
cost of fencing 1m=2.50rs
cost of fencing 188m=188*2.50=470rs ans

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