Question

the perimeter of a rectangular field is 294 m it's length and breadth are in ratio of 5:2 . find it's side and also the cost of wire required to fence the field , given the cost of 1 m wire is rupees 4.50

Answer 1

Given,
Perimeter of Rectangular Field = 294m
Let length and breadth be 5$x$ and 2$x$ respectively.
So,
Perimeter of Rectangle = 2(l+b)
or, 294 = 2(5$x$+2$x$)
or, 294 = 2(7$x$)
or, 294 = 14$x$
or, 294÷14 = $x$
or, $x$ = 21
Therefore,
Length = 5$x$ = 5 x 21 = 105m
Breadth = 2$x$ = 2 x 21 = 42m
Now, 
Cost of wire required to fence 1m field = Rs. 4.50
Cost of wire required to fence 294m field = Rs. 4.50 x 294 = Rs 1323.