"Cans of Paint" Word Problem

Hey guys, this problem has been giving me a headache for the last hour, and its the last problem I need to do before my homework is due in an hour and a half! Help!

I have two cans of paint. Can A has 9 parts of blue paint to one part of yellow paint. Can B is 20 percent blue paint and the rest is yellow paint. How much paint should I use from each can to obtain 2 liters of paint which is half blue and half yellow.

amount of can A= ___________________ liters

amount of can B= ___________________ liters