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Question

The length of a Rectangular Blackboard is three times Its width. If the width is 1.5m, Find its area. Also, find the cost of painting the Blackboard at the rate of Rs5.50persqm.


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Solution

Step 1. Calculate the area of the blackboard :

Since the length of a Rectangular Blackboard is three times Its width.

l=3w=3×1.5w=1.5m=4.5m

Areaofrectangularblackboard=l×w=4.5×1.5=6.75m2

Thus, the area of the blackboard is 6.75m2.

Step 2. Calculate the cost of the painting.

Since the rate of the painting is Rs5.50persqm.

The total cost of painting=6.75×5.50=Rs37.125

Hence, the area is 6.75m2 and the cost of painting is Rs.37.125.


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