The world_______ fewer hungry people. ( )
A:have
B:has
C:having
一罐涂料能刷完一块长为a,宽为3的长方形墙面,如果这罐涂料刷另一块长方形墙面也刚好用完,且该长方形墙面长为a+2,则宽为____ (用字母a表示).
化简:2(a+1)﹣a=____
____