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Module 1: Using Formulae 1

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XSIQ
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Algebra - Petrol stations

Petrol stations

The cost of petrol can be calculated using the formula _ C_ =_ p_ x_ L_
where _p_ stands for the cost per litre of petrol in pounds, and_ L_ is the
number of litres.

(a) Using this formula calculate the cost of 35 litres at 95 pence a
litre.

(b) If you paid 95 pence a litre for 45 litres at the first petrol
station, but the second petrol station charged 92 pence a litre, how much
would you have saved by using the second petrol station?

You may wish to go back to the interactive XSIQ petrol pump to check the
answers.

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