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Petrol remaining formula

Petrol remaining formula

Secondary 2
4 marks
TGM Original Questions

A motorist buys \(\$30\) of petrol at \(c\) cents per litre. The car uses \(x\) litres per kilometre and travels \(d\) kilometres.

  1. Show that the remaining petrol is \(R=\dfrac{3000-cxd}{c}\) litres.[2]
  2. Express \(c\) in terms of \(R,d,x\).[2]

Solution:

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Answer:(a) \(R=\dfrac{3000-cxd}{c}\) (b) \(c=\dfrac{3000}{R+xd}\).

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