There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

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?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

Can you count the number of triangles inside a triangle?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What two things can you never eat for breakfast?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

My sock drawer has 26 blue socks, 13 pink socks, 33 green socks, and 12 red socks, how many socks would I have to pull out in the dark to be sure I had a matching pair?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?