algebra
posted by Sarah on .
At work one day Erica received 36 packages. Speedy delivered 3 times as many as Express, While Express delivered 4 more than Quick Service. How many packages did each service deliver to Erica?

http://www.jiskha.com/display.cgi?id=1258043389
If you have a question from there, post it. 
Thank you BobPursley I think I get it now