龄的比例分配，又恰好分完，已知姐姐比妹妹大2岁，那么姐姐两次分到的珠子相差几颗？
There are 80 beads, five years ago, the two sisters distributed according to the proportional of age, just finished. This year, they again distributed according to the proportional of age, and just finished. It is known that the older sister is two years older than her younger sister, then how many pieces difference did the older sister in two times?
30、某人承包了一个果园，每名工人每天的工资数（以元为单位），正好与工人数相同。如果减少3名工人，而每天付出的总工资不变，这样每名工人的工资就增加3.1元。原来每名工人的工资多少元？
A person has contracted an orchard, the number of workers a day (in the yuan as a unit), just the same as the number of workers. If you cut 3 workers, and the total wages paid the same per day, so that every worker's wages increased by 3.1 yuan. How many yuan per worker?