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 d As p By considering bounds, wor?

d is to three sig. fig. so: 186.5 < d < 187.5 p is to two sig. fig. so: 27.5 < p < 28.5 you get the LARGEST value for c by dividing the LARGEST value for d by the SMALLEST value for p so: c < 187.5/27.5 = 6.818 km per litre you get the SMALLEST value for c by dividing the SMALLEST value for d by the LARGEST value for p so: c > 186.5/28.5 = 6.544 km per litre so : 6.544 < c < 6.818 hope this helped💕

Jade Etim

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Maths Tutor • GCSE • Colchester

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