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could it be x and y

you want to use two variables that is find also
unnecessary but fine

ok that was wrong
how can 187 throws bring in only $57?

oooh i got that totally wrong doh sorry

if you only use one variable how would that turn out

lets see if we can do it this way first

the total is 187 so \[x+y=187\]

and also \[\frac{x}{3}+\frac{2y}{7}=57\]

it says the number of people is suppose to be 25

really? guess i screwed that one up

and also \[x+2y=57\]

seems to work nicely, get \(x=25,y=16\)