(1/4)－(1/12)
=(3/12)－(1/12)
=2/12
=1/6
老人比年轻人多6分之1
(2/3)＋(1/4)
=(8/12)＋(3/12)
=11/12
=11/12
老人和儿童一共是12分之11两为专家谁的对啊你自己拿捏。