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Discussion Starter · #1 ·
Noone here at work claims to be a math genius and at this point noone can even figure out this guys, kids 5th grade math story problem.

Guy buys a hamburger and a large coke one day for $2.28. The next day he buys 2 hamburgers and a small coke for $4.17. How much does the small coke cost?

What's the answer? What math formula did you use to solve it. Explain your answer. (show your math)
 

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Discussion Starter · #4 ·
QUOTE(pauligan @ Sep 30 2003, 11:30 AM)4.17-2.28=1.89 (cost of one hamburger)
What about the cost of the cokes. $4.17 and $2.28 both include the cost of diffrent size cokes.
 

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FIRST YOU TAKE 2.28 FROM 4.17= 1.89 THEN TAKE 1.89 FROM 2.28 =.39 YOUR ANSWER.. ALL THE OTHER CRAP IS THERE TO CONFUSE YOU OR IN OTHER WORD MAKE YOU FIND THE SIMPLE ANSWER.... IT`S A LOGIC THING
 

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Pat, I'd like to buy a vowel.
 

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QUOTE(pauligan @ Sep 30 2003, 11:39 AM)I think bikinigirl is right; our subtraction was from the large coke, not the small coke.
Thanks Pauline,

I too have a fifth grader
 

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Hate these freaking SAT questions.... <_<

I concur, we don't have enough info; if the subtraction is made for the 1.89 price, it's still not the accurate price of one hamburger because we are assuming at that point that the cost of the drink is the same.
 

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Let X = price of hamburger
Let Y = price of large coke
Let Z = price of small coke

So, a hamburger and a large coke for $2.28: X + Y = $2.28 (1)
Two hamburgers and a small coke for $4.17: 2X + Z = $4.17 (2)
Solving (2) for Z: Z = $4.17 - 2X (3)
Solving the (1) for X: X = $2.28 - Y (4)
Plugging (4) into (3): Z = $4.17 - 2($2.28 - Y) (5)
Reducing: Z = $4.17 - $4.56 +2Y (6)
Or: Z = 2Y - $.39

Three unknowns & two equations: can't solve!
 

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I don't think it can be solved either. It was the last problem on a hand out the teacher gave the kids. With a note under it "this is a hard one" Well no sh$t not only is it a hard one I'd say impossible. Let alone for a 10 year old 5th grader.
 

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QUOTE(EZC @ Sep 30 2003, 11:53 AM)Let X = price of hamburger
Let Y = price of large coke
Let Z = price of small coke

So, a hamburger and a large coke for $2.28: X + Y = $2.28 (1)
Two hamburgers and a small coke for $4.17: 2X + Z = $4.17 (2)
Solving (2) for Z: Z = $4.17 - 2X (3)
Solving the (1) for X: X = $2.28 - Y (4)
Plugging (4) into (3): Z = $4.17 - 2($2.28 - Y) (5)
Reducing: Z = $4.17 - $4.56 +2Y (6)
Or: Z = 2Y - $.39

Three unknowns & two equations: can't solve!
 
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