What is next number in the pattern below:

131 517 192 123 ?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

How many times can you subtract the number 5 from 25?

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

How can you take 2 from 5 and leave 4?

What can you deduce from the following BrainBat?

CRY
LMKI

You can see three almost identical images below. Can you spot the odd one out from them?

Can you find the missing piece of the Porsche?