# Help with this arithmetic question

• April 12th 2013, 06:07 AM
mathkid182
Help with this arithmetic question
Matt’s motorbike can do 200 km on 13 litres of fuel. Matt’s car does550 km on 47 litres of petrol.

(a) How many ‘litres per hundred kilometres’ does each vehicle achieve?

(b) How far does each vehicle get on just one litre of petrol?

(c) Which vehicle is more fuel efficient?
• April 12th 2013, 08:13 AM
dokrbb
Re: Help with this arithmetic question
Is that question a joke or something... ;)

a) MB = 200/13 = ... * 100km =
Car = 550/47 = ... *100km =
• April 12th 2013, 02:32 PM
topsquark
Re: Help with this arithmetic question
Quote:

Originally Posted by mathkid182
Matt’s motorbike can do 200 km on 13 litres of fuel. Matt’s car does550 km on 47 litres of petrol.

(b) How far does each vehicle get on just one litre of petrol?

(c) Which vehicle is more fuel efficient?

b) Set up a proportion. For the motorbike:
$\frac{\text{distance}}{\text{amount of fuel}} = \frac{200~km}{13~L}$

Can you finish this? (The answers to b) give you the answers to c) ).

-Dan
• April 12th 2013, 10:08 PM
ibdutt
Re: Help with this arithmetic question
Just find how many km does it cover in 1 litre of petrol Motorbike 200/13 km in 1 litre and Car 550/47 km . The one that covers more distance in 1 litre is more fuel efficient.
• April 13th 2013, 05:47 AM
mathkid182
Re: Help with this arithmetic question
hi guys thanks for the help:

so to sum up is this correct:

A:
motorbike = 13/200 * 100 = 6.5 litres per hundred kilometres
car = 47/550 * 100 = 8.55 litres per hundred kilometres

B:
motorbike = 550/47 = 11.70/1
car = 220/13 = 15.39/1

C:
Which makes the bike more fuel efficient because you can get 11.70 KM per 1 litre of fuel, as opposed to 15.39 KM per 1 litre for the car?

• April 13th 2013, 07:53 AM
dokrbb
Re: Help with this arithmetic question
Quote:

Originally Posted by mathkid182
hi guys thanks for the help:

so to sum up is this correct:

A:
motorbike = 13/200 * 100 = 6.5 litres per hundred kilometres
car = 47/550 * 100 = 8.55 litres per hundred kilometres

B:
motorbike = 550/47 = 11.70/1
car = 220/13 = 15.39/1

C:
Which makes the bike more fuel efficient because you can get 11.70 KM per 1 litre of fuel, as opposed to 15.39 KM per 1 litre for the car?

Why do you consider it is the motorbike as more efficient?

can you explain?
• April 13th 2013, 08:08 AM
mathkid182
Re: Help with this arithmetic question
woops read that around the wrong way-
so the car is more efficient because it can do 15.39 KM on 1 litre of petrol rather the bike can only do 11.70KM per 1 litre of petrol?

correct?
• April 13th 2013, 08:12 AM
dokrbb
Re: Help with this arithmetic question
Quote:

Originally Posted by mathkid182
woops read that around the wrong way-
so the car is more efficient because it can do 15.39 KM on 1 litre of petrol rather the bike can only do 11.70KM per 1 litre of petrol?

correct?

now it`s correct ;)

dokrbb
• April 13th 2013, 08:12 AM
mathkid182
Re: Help with this arithmetic question
cheers!
• April 21st 2013, 04:41 AM
BenBrawn
Re: Help with this arithmetic question
MathKid182 (if that even is your real name) I hope your learnt something from the nice friendly people of the internet, however, I could have come and asked for help understanding this material from me (your course coordinator) or from the other staff. I find it annoying that you didn't change the numbers so that you could have learnt the techniques and then been confident enough to do your own assignment yourself. I hope your truly have learnt this material and the other questions I have seen asked on this and other forums because you will need it.