What is next number in the pattern below:

131 517 192 123 ?

Can you find a five letter word that is left with only two letters if one is removed?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

In the image below, can you find the value of an angle(y)

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?