Question

The length of a board is thrice it's breadth.if the perimeter of the breadth is 720m .find the dimensions of the board .if the cost of painting the board is rs 20 per square metre ,find the cost of painting the board on one side.

Answer 1

Hope this will help you

Answer 2

Let the breadth be x
then
length =3x
A/Q
3x+3x+x+x=720
8x=720
=>x=720/8
=90
Hence,
length=3x=3×90=270m
breadth=x=90m

Area of board=270×90=24300m2

Cost of fencing=24300×20
=$48600

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