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?
Reason slowly and give your answer.
35
In total, Rick is still owed 400 - 285 = $115.

Derek owes half as much as Amy, so he owes $30 / 2 = $15.

This means that Sally and Carl owe a combined total of $115 - $30 – $15 = $70.

As they owe equal amounts, they therefore owe $70 / 2 = $35 each.

.

Final answer: 35