An open tank of depth 15 cm has a horizontal base of length 30 cm and breadth 20 cm. Two wooden cubes, of side 4 cm and 7 cm respectively, rest on the base of the tank.
- Find the capacity of the tank.
- How much water must be poured into the tank so that the tank is half filled?
(a)
Capacity of the tank
= 30 x 20 x 15
= 9000 cm
3 (b)
Volume of water needed so that the tank is half filled
= 9000 ÷ 2
= 4500 cm
3 Volume of 4-cm cube
= 4 x 4 x 4
= 64 cm
3 Volume of 7-cm cube
= 7 x 7 x 7
= 343 cm
3 Total volume of the 2 cubes
= 64 + 343
= 407 cm
3
Amount of water to be poured into the tank so that it is half filled
= 4500 - 407
= 4093 cm
3 Answer(s): (a) 9000 cm
3; (b) 4093 cm
3