Fuel Consumption

[Admin]

#7540

John’s car consumes 7.25L for every 100km he drives.If he drives for 350km, how much petrol will he use?

how many lots of 100km in 350km?
350 ÷ 100 = 3.5

petrol = 7.25 × 3.5

= 25.375L

[Admin]

#18875

A motorist started a trip with a full tank of petrol and after travelling 540km refilled the tank. Given that the refilling took $45 worth of petrol at 70.9 cents per litre. Calculate: a. the number of litres of petrol used on the trip. b. the consumption rate per hundred kilometres.
a. 70.9 ÷ 100 = $0.709	Step 1: Change the cents to dollars
45 ÷ 0.709 = 63.5 L	Step 2: Find out how many litres by dividing $45 by the cost per litre
b. 540 ÷ 100 = 5.4	Step 1: Since we are interested in how many litres per 100km, we need to find out how many lots of 100 are in 540 km
63.5 ÷ 5.4 = 11.76	Step 2: To find out how many litres per 100km, we need to divide the number of litres by the number of 100 km’s
∴ 11.76 L/100km

[Admin]

#18876

A car uses 7.28 litres of petrol per 100 km. If you were to go on a 315 km trip, how many litres of petrol would the car use?
315 ÷ 100 = 3.15	find out how many lots of 100km are in 315km by dividing this means we would need to buy 3.15 lots of 7.28 litres
3.15 × 7.28L = 22.932 L	to find the number of litres multiply 3.15 by 7.28

[Admin]

#18877

The fuel consumption for John’s car is 16.7 L/100km for Urban conditions. The combined fuel consumption is 12.4 L/100km. a. The fuel consumption for the Combined Test is the average of the Urban and Extra Urban (Freeway) rates. What is Extra Urban Fuel Consumption Rate? b. John travels to work 520km each month in Urban Conditions. How many litres of fuel per month does John use travelling to work? c. John travels to work for 11 months per year. How many kilograms of CO2 emissions would John’s car make?
a. $$12.4=\frac{16.7+x}{2}$$	to find average add Urban (16.7) to Extra Urban (x) and divide by 2
24.8 = 16.7 + x	multiply both sides by 2
x = 8.1	subtract 16.7 from both sides
8.1 L/100km
b. 520 ÷ 100 = 5.2	driving in Urban conditions uses 16.7 L/100km. Find how many lots of 100km in 520 km by dividing
5.2 × 16.7 = 86.84 L	this means that John used 5.2 lots of 16.7 L, so to find his fuel used multiply
86.84 L per month
c. 520 × 11 = 5720 km	if John does  per month, multiply by 11 to find fuel for the 11 months he travels to work
5720 × 291 = 1 664 520 grams	the CO2 os 291 g per km, since he did 5720 km, multiply
1 664 520 ÷ 1000 = 1644.52	convert to kg by dividing by 1000
1644.52 kg

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