A container holds some water up to a height of 76 cm. When 4 identical wooden cubes are put into the container, the water level rises by 20 cm. One wooden cube is then removed from the tank, replaced by one metallic cube. The water level increases to 140 cm.
- Find the ratio of the volume of 1 wooden cube to 1 metallic cube.
- If the base area of the container is 135 cm², find the difference in the volume between the metallic cube and the wooden cube. Express your answer in cm³.
(a)
4 wooden cubes → water level rises by 20 cm
Height of water per wooden cube
= 20 ÷ 4
= 5 cm
Height of water after one wooden cube is removed
= 76 + 20 - 5
= 91 cm
Height of water increased with 1 metallic cube
= 140 - 91
= 49 cm
Ratio of the change in height of the wooden cube to the metallic cube
= 5 : 49
(b)
Difference between the height of the metallic cube and the wooden cube
= 49 - 5
= 44 cm
Difference between volume of the metallic cube and the wooden cube
= 44 x 135
= 5940 cm
3 Answer(s): (a) 5 : 49; (b) 5940 cm
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