A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

What country can make you shiver?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Find the next number in the sequence

5 12 24 36 ?

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

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Using eight eights and addition only, can you make 1000?

How can you make a TV, a bed, a dog, and a car liquid?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?