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Question

The total cost to paint external areas of all the 4 walls of a room with length, breadth and height as 10 cm, 20 cm and 5 cm respectively at the rate of ₹10 per sq. metre is ₹7000.


A

True

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B

False

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Solution

The correct option is B

False


Given,
l=10 cm, b=20 cm and h=5 cm

The lateral surface area of Cuboid
=2h(l+b)
=2×5(20+10)
=2×5×30
=300 cm2

(Since only the 4 walls are being considered, the 2lb from total surface area has been removed)

So, total cost required to paint the external areas of 4 walls
=300×10
=3000

Hence, the given statement is false.


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