need help on part B. thank you.

A. If 20 units of the end item are to be assembled, how many additional units of E are needed? B=22010=30unitsC=12010=10unitsD=32025=35unitsE=30212=48unitsE=102=20unitsE=352=70units Total units of Eneeded is: 138 B. An order for the end item is scheduled to be shipped at the start of week 11 . What is the latest week that the order can be started and still be ready to ship on time