How many liters of petrol does it take to go 150 km if it takes 9.5L to go 100km?

Question

Question:

 

Say you travel an average of 150km per week at the average fuel for November. Use the cars fuel efficiency to calculate how much it will cost you per week to put petrol in your car.

 

• The average fuel cost for November is $136.71
• The cars fuel efficiency is 9.5L / 100km.
  

Answer 1

Hi Emma--

 

Since 150 is half-again 100 (that is, it's one-and-a-half times the 100),

 

you'll need the same ratio of increase in the amount of fuel, so 9.5 + another 1/2 of 9.5.

 

Half of 9.5 = 4.75. Add that to the original 9.5 and you get 14.25 liters per 150 km.

 

So that's your weekly use.

 

In order to figure out the cost, you need to take into account that November is 30 days, which means it has 4.3 weeks (rounded).

 

Divide 136.71 (monthly cost) by 4.3, and that's your weekly cost. (31.79 per week.)

 

Hope this helps!

 

Matt in NY