y= total $ they earned. x= # cookies matt made. Phil made 25% more cookies than matt; the cookies sold for $0.25 each and after the sale, 20% of combined total of their cookies remained
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Let x be the number of cookies Matt made, so Phil made 1.25x cookies.

If all the cookies had been sold they would have made $0.25(x+1.25x).

But 20% remained, so 80% we’re sold and they raised y=0.8×0.25×2.25x=$0.45x.

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