Guzzling Gas

Algebra Level 1

The prices of gas is $4.50 (in US dollars) per gallon in Chicago. Calvin purchases 12 gallons of gas to fill up his Hyundai Elantra. How much (in US dollars) does this cost him?

Details and assumptions

Ignore any tax considerations. It has already been included in the price.


The answer is 54.

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Arron Kau by Arron Kau

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11 solutions

Kiruthiga K
Dec 30, 2013

Per gallon the price of gas costs $4.50...so for 12 gallons we can write 12*4.50=54$

1 Helpful 0 Interesting 0 Brilliant 0 Confused 

     1 gallon     = $4.50
thus 12 gallons = 4.50*12 = $54

Sangeetha Sg - 7 years, 5 months ago
Jemay Dedumo
Jan 3, 2014

4.50 * 12 = 54

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Mohamed Jalloh
Jan 3, 2014

you first break down $4.50 in two and multiply both by 12, so it will be 50 cent 12=600 cents or 6 dollars and 4 12=48 dollars then you add the 6 dollars and 48 dollars together to get $54.

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Mohsin Ikram
Jan 3, 2014

Cost of 1 gallon of gas = 4.50 $
Cost of 12 gallons of gas = (4.50)(12)
Cost of 12 gallons of gas = 54 $ (US)

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Saadi Ali
Jan 2, 2014

it is a direct proportion. If one gallon cost $4.50, the how much will 12 gallon. Gallon $ 1 4.50 12 ?=x Cross multiply........ => 1 x = 4.50 12 1x = 54 x = 54/1 So as x is equal to the price of 12 gall gas =54

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Zameer Sheikh
Jan 2, 2014

PRICE OF GAS PER GALLON=4.5 SO,12 GALLONS COST=12(4.5)=54

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Unnati Bindal
Dec 30, 2013

its really simple... price of gas per gallon is $4.50.. this implies that cost of 12 such gallons will be 4.50*12= $54.... :)

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Can you please tell the correct rule is DMAS or PEMDAS

zameer sheikh - 7 years, 5 months ago

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Both are the same. You can use any one of them :)

Vedant Saini - 2 years, 5 months ago
Lai Xu
Dec 30, 2013

total cost = price per gallon * total gallon = $4.50 * 12(gallons) = $54

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Muhammad Jamil
Dec 30, 2013

1 gallon price =$ 4.50 12 gallons price = $ (4.50 x12) = $ 54

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Badal Gawande
Dec 30, 2013

4.50 * 12 = 50

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Ruhan Habib
Dec 30, 2013

Just multiply the price of the gas with the quantity .

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