What work can one never finish?

Which word does the below Plexor means ?

what does the below rebus mean?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Why did the Girl throw the butter out of the window?

I am quite hot but become too cold if you remove the first two letters. What am I?

What does a man do only once in his lifetime, but women do once a year after they are 29?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Next Number in the Series,

5, 16, 49, 104, ?