The cost of papering four walls of a room at `70p a i s e` per square metre is `R s .157.50.` The height of the room is `5m e t r e sdot` Find the length and the breadth of the room if they are in the ratio `4: 1`.

Explanation

Cost of papering four walls at `Rs 157.50`
Per `m^2=Rs 157.50`
Therefore
The surface area =`(Rs 157.50)/(Rs0.7)`
`225m^2`
`l=4x,b=x`and `h=5metres`
To find the lenght and breath
`2h=(l+b)=225`
`2xx5(4x+x)=225`
`10xx5x=225`
`50x=225`
`x=225/50`
`x=9/2`
`x=4.5`
Hence,` l=4x`
`l=4xx4.5`
`l=18m`
`b=x=4.5m`
`h=5meters`