An open tank of depth 20 cm has a horizontal base of length 40 cm and breadth 35 cm. Two wooden cubes, of side 7 cm and 8 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
= 40 x 35 x 20
= 28000 cm
3 (b)
Volume of water needed so that the tank is half filled
= 28000 ÷ 2
= 14000 cm
3 Volume of 7-cm cube
= 7 x 7 x 7
= 343 cm
3 Volume of 8-cm cube
= 8 x 8 x 8
= 512 cm
3 Total volume of the 2 cubes
= 343 + 512
= 855 cm
3
Amount of water to be poured into the tank so that it is half filled
= 14000 - 855
= 13145 cm
3 Answer(s): (a) 28000 cm
3; (b) 13145 cm
3