the length of a rectangular blackboard is three times its width .if the width is 1.5 metre, find its area also find the cost of painting the blackboard at the rate of ,₹ 4 per sq.m
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Answer:
width=1.5m
length=3(1.5)m=4.5m
area=length x width
area=1.5 x 4.5=6.75 sq.m
cost per sq.m=4
cost 6.75 sq.m=4 x 6.75=27
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