smc-805-10-Fuel

Measurement, STD2 M7 2025 HSC 38

A car’s fuel efficiency is 30 miles per US gallon.

\begin{array}{|ll|}
\hline
\rule{0pt}{2.5ex} 1 \ \text{US gallon}=3.8 \ \text{litres } \rule[-1ex]{0pt}{0pt}& \text{(correct to } 2 \text { significant figures)} \\
\rule{0pt}{2.5ex} 1 \ \text{mile}=1.6 \ \text{km} \rule[-1ex]{0pt}{0pt}& \text{(correct to } 2 \text { significant figures)} \\
\hline
\end{array}

Calculate the car’s fuel efficiency in litres per 100 km, correct to 1 decimal place. (3 marks)

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$\text{Fuel efficiency}=7.9 \ \text{litres / 100 km}$

Show Worked Solution

$30 \ \text{miles}=30 \times 1.6=48 \ \text{km}$

$\text{Convert 48 km per 3.8 litres into km/litre:}$

$\dfrac{48}{3.8}=12.631 \ldots \ \text{km/litre}$

$\text{Fuel used in 100 km}=\dfrac{100}{12.631\ldots}=7.917\ldots=7.9 \ \text{litres (1 d.p.)}$

$\therefore \ \text{Fuel efficiency}=7.9 \ \text{litres per 100 km}$

v1 Algebra, STD2 A2 2014 HSC 22 MC

Maya’s hybrid uses fuel at the rate of 7.4 L per 100 km for highway driving and 10.2 L per 100 km for urban driving.

She drove a total of 720 km, of which 120 km were urban driving.

Approximately how much fuel did Maya’s car use on the journey?

55 L
57 L
60 L
65 L

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`B`

Show Worked Solution

`text(Fuel used in urban driving)`

`= 120/100 xx 10.2\ text(L) = 12.24\ text(L)`

`text(Fuel used on highway)`

`= 600/100 xx 7.4\ text(L) = 44.4\ text(L)`

`:.\ text(Total Fuel)`	`= 12.24 + 44.4`
	`= 56.64\ text(L) ~~ \approx 57\ text(L)`

`=> B`

Algebra, STD2 A2 SM-Bank 4 MC

A car travels 350 km on 40 L of petrol.

What is its fuel consumption?

7.8 L/100 km
8.4 L/100 km
8.8 L/100 km
11.4 L/100 km

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`D`

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`text(40 litres are used to travel 3.5 × 100 km)`

`text{Fuel consumption (L/100 km)}`

`= 40/3.5`

`= 11.428`

`= 11.4\ text(L/100 km)`

`=> D`

Algebra, STD2 A2 2018 HSC 5 MC

The driving distance from Alex's home to his work is 20 km. He drives to and from work five times each week. His car uses fuel at the rate of 8 L/100 km.

How much fuel does he use driving to and from work each week?

16 L
20 L
25 L
40 L

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`text(A)`

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`text(Total distance travelled each week)`

`= 5 xx 2 xx 20`

`= 200\ text(km)`

`:.\ text(Total fuel used)`

`= 200/100 xx 8\ text(L)`

`= 16\ text(L)`

`=>\ text(A)`

Algebra, STD2 A2 2017 HSC 14 MC

Kate is comparing two different models of car. Car A uses fuel at the rate of 9 L/100 km. Car B uses 3.5 L/100 km.

Suppose Kate plans on driving 8000 km in the next year.

How much less fuel will she use driving car B instead of car A?

A. `text(280 L)`

B. `text(440 L)`

C. `text(720 L)`

D. `text(1000 L)`

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`=>\ text(B)`

Show Worked Solution

`text(Fuel used by car)\ A`

`= 8000/100 xx 9`

`= 720\ text(L)`

`text(Fuel used by car)\ B`

`= 8000/100 xx 3.5`

`= 280\ text(L)`

`:.\ text(Fuel saved using car)\ B`

`= 720 – 280`

`= 440\ text(L)`

`=>\ text(B)`

Algebra, STD2 A2 2016 HSC 26c

Peta’s car uses fuel at the rate of 5.9 L /100 km for country driving and 7.3 L /100 km for city driving. On a trip, she drives 170 km in the country and 25 km in the city.

Calculate the amount of fuel she used on this trip. (2 marks)

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`11.855\ text(L)`

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`text(Fuel used in country)`

`= 170 xx 5.9/100`

`= 10.03\ text(L)`

`text(Fuel used in city)`

`= 25 xx 7.3/100`

`= 1.825\ text(L)`

`:.\ text(Total fuel used)`

`= 10.03 + 1.825`

`= 11.855\ text(L)`

Algebra, STD2 A2 2014 HSC 27b

Xuso is comparing the costs of two different ways of travelling to university.

Xuso’s motorcycle uses one litre of fuel for every 17 km travelled. The cost of fuel is $1.67/L and the distance from her home to the university car park is 34 km. The cost of travelling by bus is $36.40 for 10 single trips.

Which way of travelling is cheaper and by how much? Support your answer with calculations. (2 marks)

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`text(Motorcycle is $0.30 cheaper per 1-way trip)`

Show Worked Solution

`text(Compare cost of a 1-way trip)`

`text(Motorcycle)`

`text(Fuel used) = 34/17 = 2\ text(L)`

`text(C)text(ost) = 2 xx $1.67 = $3.34`

`text(Bus)`

`text(C)text(ost) = 36.40/10 = $3.64`

`text(Difference) = $3.64\ – 3.34\ = $0.30`

`:.\ text(Motorcycle is $0.30 cheaper per 1-way trip.)`

Algebra, STD2 A2 2014 HSC 22 MC

Heather’s car uses fuel at the rate of 6.6 L per 100 km for long-distance driving and 8.9 L per 100 km for short-distance driving.

She used the car to make a journey of 560 km, which included 65 km of short-distance driving.

Approximately how much fuel did Heather’s car use on the journey?

37 L
38 L
48 L
50 L

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`B`

Show Worked Solution

`text(Fuel used in short distance)`

`= 65/100 xx 8.9\ text(L) = 5.785\ text(L)`

`text(Fuel used in long distance)`

`= 495/100 xx 6.6\ text(L) = 32.67\ text(L)`

`:.\ text(Total Fuel)`	`= 5.785 + 32.67`
	`= 38.455\ text(L)`

`=> B`