Jody practiced a piano pieces for 500 seconds bill practice a piano pieces for eight minutes to practice longer explain

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

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Ineed me i stuck and i don’t want to get it wrong