Deanna keeps a record of the petrol she puts into her car and the current distance it has covered so she can estimate her fuel consumption. When she puts petrol in, sometimes the tank is filled completely and she marks ‘FULL’ beside the entry if this is so, otherwise the tank is only partly filled.

Her data for the last month is as follows:

Which one of the following is the best estimate of her fuel consumption?

A. 9.9 litres / 100 km

B. 7.7 litres / 100 km

C. 1.7 litres / 100 km

D. 6.8 litres / 100 km

E. 8.0 litres / 100 km

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Anyone help with this question? Flagged it and still not sure how to answer it?

From full tank on 6 June to the next full tank on 23 June she used 25+21+34=80 liter of benzen to cover 1184 Km.

So, for 100 Km, Deanna has used 100 . 80/1184=6.75 liter which is close to the 6.8 liters/100 Km estimate.

So, the answer will be D.

Thank you appreciate it, I was overthinking it so much, i dont really understand the full tank section from the question tbh

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You’re welcome.

IT seems that Deanna got the tank full whenever she planned to travel more than 465 Km, not because she did not have enough fuel, maybe because she was not sure whether she could find any tank station in her next 465 Km ahead.

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