3. The floor of a room is 6 m long and 4.2 m wide. It has a border of 20 cm laid with green marble. The remaining floor has a white marble. Find the area covered with green and white marble separately ?
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Dimensions of the floor of the room
Length 6m
breadth - 4.2m
Area of the entire room
Area = l*b
= 6*4.2
= 25.2 square metre
the floor has a border of green marble of 20cm = 0.2 m
New Length = l - 2 w = 6 - (2*0.2) = 5.6 m
New Breadth = B-Day 2w = 4.2 -(2*0.2) = 3.8m
New Area = l*b
5.6*3.8
= 21.28 square metre
Area = area of entire floor - area of white marble
= 25.2- 21.28
= 3.92 square metre
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