What is next number in the pattern below:

131 517 192 123 ?

Can you name four days which start with the letter 'T'?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

Why is the Hole below a Lock?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

Find the next number in the series below

21 32 54 87 131 ?

What does this rebus riddle means ?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

Why do we preferably have round manhole covers and not square ones?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?