the Planet of all rectangular blackboard is 3 times width. If the width is 1.5 metre, find its area. Also find the cost of painting the blackboard at rupees 5.50 per square metre.
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Width of rectangle=1.5m
Length=3 times of width
=3×1.5=4.5
Area=1.5×4.5=6.75
Cost=6.75×5.50=37.125
Length=3 times of width
=3×1.5=4.5
Area=1.5×4.5=6.75
Cost=6.75×5.50=37.125
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