What is next number in the pattern below:

131 517 192 123 ?

What is the next number in the series?

15 29 56 108 208 ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What does it mean?

When we see 2 but call 10?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

What does this rebus riddle means ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

It is always ahead of me yet I can never see it. What is it?