The cost of painting the 4 walls of a room at rs 4 per square metre is rs 1280.if the length is thrice the breath and the height is 5 metres, what is the length of the room?
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rs 4 = 1m^2
rs1= 1/4
rs 1280 = 1280/4
=320 m^2
let breath = x
length =3x
area of four walls = 2 (l+b)×h
2 (3x+x)×5 = 320
40x = 320
x= 320/40
x=8
length = 3×8
=24 m
rs1= 1/4
rs 1280 = 1280/4
=320 m^2
let breath = x
length =3x
area of four walls = 2 (l+b)×h
2 (3x+x)×5 = 320
40x = 320
x= 320/40
x=8
length = 3×8
=24 m
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