Tiling the roofs of houses with clay tiles reduces the transfer of heat due to circulation of air them. This helps in reducing the energy costs. Nine tiles cover an area of 1 sq cm. how many tiles are needed to tile the complete roof, of which one side is shown in the figure? If a tile cost Rs.35, how much does it cost to tile the roof completely? (hint: the roof is made up of two rectangles)
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7 - 8 tiles are needed to complete the roof
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