maria had $123 she spent $35,loaned $20 to a friend and received her $90 paycheck how much does she have now? so you would do 123 -20=103

and then 103 - 20=83
and 83 + 90 =wich is 173 so that would be the answer right?

You forgot the $35 that she spent, but you subtracted the $20 twice.