Find the height of a wall whose length is 8 m and which is covered by 1760 tiles of size 25 cm by 20 cm.
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Step-by-step explanation:
Let the height of the room be x meters.
∴ its breadth =2x meters
∴ Area of the four walls =2×x(18+2x)=36x+4x2
⇒36x+4x2=2×2×70
⇒x2+9x−70=0
⇒(x+14)(x−5)=0
⇒x=5
Breadth =2×5=10m
Area of the floor =18×10=180 sq.meter
Cost of paving the floor =180×20=Rs.3600
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