A rectangular container, 90 cm by 45 cm by 45 cm, is filled with water to a height of 7 cm. The ratio of the volume of water in the container to that in a barrel is 9 : 2. If
23 of the barrel is filled with water, find
- the volume of the barrel.
- the minimum number of such barrels to fill the container.
(a)
Volume of water in the container
= 90 x 45 x 7
= 28350 cm
3 9 u = 28350 cm
3 1 u = 28350 ÷ 9 = 3150 cm
3 2 u = 2 x 3150 = 6300 cm
3 Volume of water in
23 of the barrel = 6300 cm
3 Volume of the barrel
= 6300 ÷
23 = 6300 x
32 = 9450 cm
3 (b)
Volume of the container
= 90 x 45 x 45
= 182250 cm
3 Number of barrels to fill the container
= 182250 ÷ 9450
= 19 r 2700
Minimum number of barrels to fill the container
= 19 + 1
= 20
Answer(s): (a) 9450 cm
3; (b) 20