Drove 238 miles and used 27.3 litres of petrol: find upper bound for consumption per mile, considering measurement errors $X$ drove $238$ miles, correct nearest mile. They used $27.3$ litres of petrol, to the nearest ...--prophetes.ai

Drove 238 miles and used 27.3 litres of petrol: find upper bound for consumption per mile, considering measurement errors $X$ drove $238$ miles, correct nearest mile. They used $27.3$ litres of petrol, to the nearest tenth of a litre. ## $\text {Petrol Consumption} =$$\text {Miles}\over \text {Petrol Used}$ Work out the upper bound. * * * I used $238.5\over 27.35$ to get $8.72 (2dp)$ however the book states the answer is $8.75$ Am I wrong, and how? Or is it simply an error on the book's behalf? Thanks.

PetrolConsumption is maximized when PetrolUsed is _minimized_.

$$\frac{238.5}{27.25} \simeq 8.75 $$