A system of equations, I must be setting it up wrong?

Question

For each of n people, Margie bought a hamburger and a soda at a restaurant. For each of n people, Paul bought 3 hamburgers and a soda at the same restaurant. If Margie spent a total of $5.40 and Paul spent a total of $12.60, how much did Paul spend just for hamburgers? (Assume that all hamburgers cost the same and all sodas cost the same.)
Please show the set up and explain

Bryce · Answer

It's technically impossible to determine the costs or the number of people by itself, and totally unnecessary for the problem. We have unknown costs H and S for hamburgers and sodas, and we have an unknown number of people N. With those variable names, the question is to determine the value of 3*H*N. Since everything is given in terms of S*N and H*N, this will be easy to solve.

Bullwinkle · Answer

...if you want help, show your work !

"I must be setting it up wrong?"

to learn what you are doing wrong, show us 'what you are doing !'

[hamburgers cost:  $3.60 each, sodas cost:  $1.80 each ]

euclid

Randy P · Answer

I can't tell if you set it up wrong. You didn't show any evidence of your own work.

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A system of equations, I must be setting it up wrong?

3 Answers