Question

The length of a rectangular black board 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 rupees 5.50 per sq. m.

Answer 1

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Breadth (b)=1.5meter
Length=3 times width
l=3(1.5)
Length=4.5 meters

${\green{Area=Length×Breadth}}$

Area=(4.5×1.5)

${\pink{Area=6.75m^2}}$

Cost =Area ×5.5 rupees
Cost = 6.75×5.5/-

${\blue{Cost=37.125/-}}$

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Answer 2

The cost of painting the blackboard at the rate of rupees 5.50 per sq. m. is Rs.37.125

Step-by-step explanation:

Width of rectangular board = 1.5 m

The length of a rectangular black board is three times its width

Length of rectangular board = 3(1.5)=4.5 m

Area of rectangular board = $Length \times Breadth = 1.5 m \times 4.5 m =6.75 m^2$

Cost of 1 sq.m. = Rs.5.50

Cost of 6.75 sq.m. =$6.75 \times 5.50=Rs.37.125$

Hence the cost of painting the blackboard at the rate of rupees 5.50 per sq. m. is Rs.37.125

#Learn more:

The area of a rectanguler field is 10092 sq m. Its length is three time as long as its width . Find its perimeter

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