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I don’t get it :(

Working on itts i’m going to need you to me as i go along 1-5

Carson has only $20 bills and $10 bill in her wallet. the total value of the bills is $50. she has 1 more $20 bill than $10 bills. how many each kind of bill does carson have? a. one $20 and two $10 bills b. two $20 bills and one $10 bill c. one $20 bills and three $10 bills d. two $20 bills and two $10 bills

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution