Rates and variations questions | form three Basic Mathematics

Four people can eat 2 bags of rice each weighing 10kg in 12 days. How many people can eat 6 bags of rice of the same weight in 18 days?.

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UNSOLVED

The surface area of a sphere , V mm² varies directly as the square of its diameter d mm. If the surface area is to be doubled, what ratio must the diameter be altered?

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UNSOLVED

Juma sells one litre of milk at sh 600. How many litres of milk will Juma sell to get sh 208,800?.

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UNSOLVED

The compression l of a spring is directly proportional to the thrust, T newtons exerted on it . If a thrust of 2 newtons produces a compression of 0.4cm, find:

1. The compression when the thrust is 5 newtons
2. The thrust when the compression is 0.7cm.

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UNSOLVED

A bus travels 240km using 16 litres of diesel. How many litres of diesel are needed to drive 90km?

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UNSOLVED