Bob has twice as much money as Kenny. Steven has $78 more than Bob. Ann has $139 more than the total amount that Bob, Steven and Kenny have. Ann has $545 more than Kenny. How much money has Ann?
b = 2k
s = b+78
a = b+s+k+139
a = k+545
a = 627
s = b+78
a = b+s+k+139
a = k+545
a = 627