Rick held a fundraiser and is figuring out who still owes money. He marked on a sheet how much everyone has promised to contribute, but he forgot to note how much some people had actually paid. Altogether, everyone has promised to contribute $400, and Rick has actually received $285.  Sally, Amy, Derek, and Carl all still owe money. Sally and Carl both owe equal amounts, Amy owes $30, and Derek owes half as much as Amy. How much, in dollars, do Sally and Carl each owe?
In total, Rick is still owed 400 - 285 = $<<400-285=115>>115.
Derek owes half as much as Amy, so he owes $30 / 2 = $<<30/2=15>>15.
This means that Sally and Carl owe a combined total of $115 - $30 – $15 = $<<115-30-15=70>>70.
As they owe equal amounts, they therefore owe $70 / 2 = $<<70/2=35>>35 each.
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