Question 308798
x = 5's , y = 10's , z = 20's


"Donesha has $100 in five, ten and twenty dollar bills" ___ 5x + 10y + 20z = 100


"Donesha has twice as many five dollar bills as ten dollar bills" ___ x = 2y


"she has one more twenty than she has tens" ___ z = y + 1