challenge....homework help.?

Question

mary and donata have lunch, and each agrees to pay half of the $30 cost (which includes tax and tip) Mary has two $10 bills, and donata has a $20 bill and two $5 bills. Is there a way for them to pay the bill without getting change? Explain.

Answer 1

Mary gives Donata the 2 tens and Donata gives her back a five and Donata pays the bill.
Or Donata gives Mary a twenty and a five and Mary gives her back a ten and Mary pays the bill.