What happened when the wheel was invented?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

I can be cracked, made, told, and played. What am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

By using 'because' continuously three times, can you make an English statement ?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.