Question

m by I m. Find the cost of painting the walls at Rs. 3.50 per square metre.
17. The length and breadth of a hall are in the ratio 4: 3 and its height is 5.5 metres.
The cost of decorating its walls (including doors and windows) at Rs. 6.60 per
square metre is Rs. 5082. Find the length and breadth of the room.
18. A wooden bookshelf has external dimensions as follows: Height = 110 cm, Depth
= 25 cm, Breadth 85 cm (See Fig. 18.5). The thickness of the plank is 5 cm
everywhere. The external faces are to be polished and the inner faces are to be
painted. If the rate of polishing is 20 paise per cm2 and the rate of painting is 10
paise per cm? Find the total expenses required for polishing and painting the
surface of the bookshelf.
19. The paint in a certain container is sufficient to paint on area equal to 9.375 m2. How
many bricks of dimension 22.5 cm x 10 cm x 7.5 cm can be painted out of this
container?
20. A cuboidal water tank is 6 m long, 5 m wide and 4.5 m deep. How many litres of
water can it hold?
21. A cubical vessel is 10 m long and 8 m wide. How high must it be made to hold 380
cubic metres of a liquid?
22. Find the cost of digging a cuboidal pit 8 m long, 6 m broad and 3 m deep at th
rate of Rs. 30 per m3
23. If V is the volume of a cuboid of dimensions a, b, c and S is its surface area, th
2/1​

Answer 1

Answer:

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