Kerosene
3 marks · NormalA domestic kerosene heater uses 2.5 litres of kerosene fuel per day. State one use of kerosene and calculate how many litres would be used in one week (7 days) if used at the same rate.
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17.5 litres (±0.1)
(calculation) 17.5 litres
Also accept: Any reasonable kerosene use: heating, lamps, etc.
Common mistakes: Multiplying by 6 instead of 7; Incorrect operation (adding instead of multiplying)
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Marking points
B1 · 1 mark · States any correct use of kerosene (e.g., heating, fuel for lamps, jet fuel, cooking).
M1 · 1 mark · Correct method: multiplies 2.5 litres by 7 days.
A1 · 1 mark · Gives correct answer: 17.5 litres. (follow-through)
Worked solution
Any correct use: Kerosene is used as fuel in heaters.
Calculation: daily use = 2.5 litres
Total in 7 days = 2.5 litres/day × 7 days = 17.5 litres