Question

1. Find the volume, lateral surface area and the total surface area of the cuboid whose
EXERCISE 20A
X8
dimensions are:
(i) length
22 cm, breadth
(ii) length
12 cm and height = 7.5 cm
15 m, breadth = 6 m and height
9 dm
1000 cm3 - I line
(iii) length = 24 m, breadth = 25 cm and height = 6 m.
(iv) length
48 cm, breadth
6 dm and height = 1 m
2. The dimensions of a rectangular water tank are 2 m 75 cm by 1 m 80 cm by 1 m 40 cm. How
many litres of water does it hold when filled to the brim?
3. A solid rectangular piece of iron measures 1.05 mx 70 cm x 1.5 cm. Find the weight of this
piece in kilograms if 1 cm of iron weighs 8 grams.
4. The area of a courtyard is 3750 m. Find the cost of covering it with gravel to a height of
1 cm if the gravel costs * 6.40 per cubic metre.
5. How many persons can be accommodated in a hall of length 16 m, breadth 12.5 m and
height 4.5 m, assuming that 3.6 m of air is required for each person?
6. A cardboard box is 1.2 m long, 72 cm wide and 54 cm high. How many bars of soap can be
put into it if each bar measures 6 cm x 4.5 cm x 4 cm?
7. The size of a matchbox is 4 cm x 2.5 cm x 1.5 cm. What is the volume of a packet containing
144 matchboxes? How many such packets can be placed in a carton of size 1.5 mx 84 cm x
60 cm?
8. How many planks of size 2 m x 25 cm x 8 cm can be prepared from a wooden block 5 m
long, 70 cm broad and 32 cm thick, assuming that there is no wastage?
9. How many bricks, each of size 25 cm x 13.5 cm x 6 cm, will be required to build a wall 8 m
long, 5.4 m high and 33 cm thick?
10. A wall 15 m long, 30 cm wide and 4 m high is made of bricks, each measuring
1
22 cm x 12.5 cm x 7.5 cm . If of the total volume of the wall consists of mortar, how many
12​

Answer 1

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