Someone answer quickly

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

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

What are the excluded values? m+5/mn+3m