90 coins in a jar of quarters and nickels. There is a total of $15.10, how many nickels and how many quarters are in the jar?
--so far, I have the 2X2 linear system set up as so:
15.10 = .05n + .25q
90 = .05n + .25q
--is this correct? and how should I solve it, substitution or elimination?
Thanks!

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seems correct but not correct to me.

there's something wrong about it.

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