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david drove a distance (d) of 187 km, correct to 3 significant figures.
he used 28 litres of petrol (p), correct to 2 significant figures.
the petrol consumption (c) of a car, in km per litre, is given by the formula
c=d
by considering bounds, work out the value of c for david's journey
to a suitable degree of accuracy.
you must show all your working and give a reason for your final answer.