Question

Exercise - 15.5
a) The volume of a rectangular box is 1680 cm and its height is 10 cm
placed on a table, find the area covered by it on the table.
b) A rectangular room contains 600 m of air and its height is 5 m.
(i) Find the area of its floor.
(ii) Find the cost of carpeting its floor at Rs 60 per sq.m.
c) A cubical room contains 216 m² of air.
(1) Find the length of its floor.
(ii) Find the area of its floor.
(iii) Find the cost of carpeting its floor at Rs 50 per sq. m.
A rectangular water tank is 150 cm high and the area of its base is 30
Find the capacity of the tank in litre. (1000 cm = 11)​

Answer 1

Answer:

1. Volume of rectangular box=1680cm^3
2. Height of box= 10cm
3. Volume of cuboid =l×b×h
4. =1680=l×b×10
5. L×b=168
6. The area coverd by box is
7. l×b
8. =168cm^2