164 PS. Law firm has branches in X,Y andZ states.
Each Lawyer has either a license in one state or in all three states
. there are 10, 11, 13 lawyers licensed in the 3 states respectively.
there are 28 lawyers in total in the firm. how many lawyers work in state Z?
设in all three states的人数是X，
10-x+11-x+13-x=28-x 算出x=3，那么只在Z的就是13-3=10
請問這題10-x+11-x+13-x 代表什麼意思
28-x 的意思是指除了3個地方都有註冊以外 ＸＹＺ地方分別的人數嗎
不太懂
麻煩了
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