Because of the conical shape of the container, the value of a bin of mineral sand is directly proportional to the square root of the height of mineral sand in the container.
If the value of the sand in the container is $5m when the height is 9 metres, what will be the value when the height is 16 metres?
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The amount of fuel used on a trip of 80 km is 16 litres. If the amount of fuel used is directly proportional to distance travelled, how many litres of fuel will be used on a trip of 235 km?
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Seven men can lay 56 sq m of concrete in a day. How many sq m of concrete can 11 men lay in the same time period?
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