Volume of a Cuboid = base area × height = length × breadth × height
                   = $l×b×h$ 


     Volume of a Cube = edge × edge × edge = $a^3$ 
    

EXERCISE 13.5

1. A matchbox measures 4 cm × 2.5 cm × 1.5 cm. What will be the volume of a packet
containing 12 such boxes?

2. A cuboidal water tank is 6 m long, 5 m wide and 4.5 m deep. How many litres of water
can it hold? (1 $m^3$ = 1000 $l$)

3. A cuboidal vessel is 10 m long and 8 m wide. How high must it be made to hold 380
cubic metres of a liquid?

4. Find the cost of digging a cuboidal pit 8 m long, 6 m broad and 3 m deep at the rate of
₹ 30 per $m^3$.

5. The capacity of a cuboidal tank is 50000 litres of water. Find the breadth of the tank,
if its length and depth are respectively 2.5 m and 10 m.

6. A village, having a population of 4000, requires 150 litres of water per head per day. 
It has a tank measuring 20 m × 15 m × 6 m. For how many days will the water of this tank
last?

7. A godown measures 40 m × 25 m × 15 m. Find the maximum number of wooden crates
each measuring 1.5 m × 1.25 m × 0.5 m that can be stored in the godown.

8. A solid cube of side 12 cm is cut into eight cubes of equal volume. What will be the
side of the new cube? Also, find the ratio between their surface areas.

9. A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water
will fall into the sea in a minute?