math problem help please

[noob with an RS 10+ year member]

ok this is a word problem:

how much of a 40% antifreeze solution must a mechanic mix with an 80% antifreeze solution if 20 gallons of a 50% antifreeze solution are needed??

can someone PLEASE show me how i can write this equation out so i can learn to solve these types of equations by myself? your help would be greatly appreciated!!

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[lilmaniac2 5,000+ posts]

.4x + .8(20-x) = .50x

i think

 

[lilmaniac2 5,000+ posts]

im not real sure about the .50x part....

 

[lilmaniac2 5,000+ posts]

http://www.purplemath.com/modules/mixture.htm

 

[noob with an RS 10+ year member]

http://www.purplemath.com/modules/mixture.htm

i can't use those tickets and dollars as an example to relate to this problem.. im stumped //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[noob with an RS 10+ year member]

i can't use those tickets and dollars as an example to relate to this problem.. im stumped //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

nevermind i scrolled down somewhere and saw that they used another example with liters and %'s thanks!!!

 

[bimma85 5,000+ posts]

15g of 40 and 5g of 80, correct?

 

[lilmaniac2 5,000+ posts]

yes

 

[lilmaniac2 5,000+ posts]

were covering this in College Algebra right now... gotta love that general studies program

 

[AllStar1500bd 5,000+ posts]

noob, check your PM's... //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif