Question #20

Thursday, November 5, 2009
Hell0 9-05! Linda here to explain how to do Question 20 from our math textbooks. Hopefully I've done this question correctly and you'll all have learned a thing or two. If not, I strongly suggest you comment about it! Read on, faithful bloggers!

20) Research to find out the current price of gasoline in Calgary, Alberta. It is 300 km from Calgary to Edmonton. How much would it cost to drive this distance in a car with a fuel consumption of 5.9 L/100 km than in a car with a fuel consumption of 9.4 L/100 km? Give your answer in dollars, expressed to the nearest cent.

Distance = 300 km
Car A gas average speed = 5.9 L /100 km
Car B average speed = 9.4 L /100 km
Gas Price: 88.9 (This was found online)

To find out how much gas money Car A and Car B needs
To find how much more money Car B needs than Car A.

We know how many litres are used for 100 km, but we need to know how many litres it takes to go 300 km since that is the distance from Calgary to Edmonton. So we need to multiply 100 km by 3, and 5.9 L by 3 in order to find the amount of litres used for 300 km. The process is shown simply below.

(Note: If you have difficulties with multiplying decimals, I strongly suggest reading past scribes or consulting Mr. B)

OK! So now we know the total amount of litres it takes to get from Calgary to Edmonton using Car A: 17.7 Litres. Now we need to know how much it will cost, so we multipy the litres by how much litres cost.

So we know how much money Car A needs for a 300 km trip to Edmonton from Calgary. But we still need to figure out how much Car B needs for a 300 km trip from Calgary to Edmonton. Remember! Our GOAL is to find out how much more money Car B needs more than Car A.

Now we need to find how much gas money Car B needs. We follow the same process.

Here is where we multiply the total amount of litres by how much gas costs per litre.
Alright then! Now we know how much gas money each car needs in order to complete the 300 km trip to Edmonton! Our final GOAL is to see how much more money Car B uses than Car A. All we need to do now is...
Yup! That's right, find the difference! Car B used $9.40 more than Car A.

Thank you for reading my post! I look forward to reading all of yours and posting comments, as I hope you will comment on my post, too!


shaneille 9-05 said...

Great Job Linda! I didn't understand this question, until you posted it, thanks. I really liked how you put what we knew, and what we needed to find out. Great Job again!

linda 9-05 said...

Aw, thanks! That means a lot :)

Lissa 9-05 said...

GOOD JOB LINDA! I agree with Shaneille, I thought this question was confusing, but after i read your post, it made alot more sense. Good job linda! Keep up the good work! :)

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