Question

EXERCISE 20A
1. Find the volume, lateral surface area and the total surface area of the cuboid whose
dimensions are:
(1) length - 22 cm. breadth = 12 cm and height = 7.5 cm
(ti) length - 15 m, breadth=6 m and height = 9 dm
(111) length - 24 m. breadth = 25 cm and height
(iv) length = 48 cm, breadth = 6 dm and height
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
60 cm?​

Answer 1

Answer:

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