David drove a distance d of 187km, 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/p 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.
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