What happened when the wheel was invented?

What is the below Rebus indicate?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

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?

Can you divide the below-given shape into four equal and identical pieces?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?