13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Rearrange the letters in "new door" to make one word.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Can you find the key in the picture below?

Why Wine Glass Stem is so long?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

What does below Rebus say?

XLR8