Can you go through the steps how to solve it?

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

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Prove that quadrilateral is a rhombus.