Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

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

Count the number of triangles in the picture below:

The dirtier I get, the whiter I look. Who am I?

why number 8549176320 is one of a kind?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

When 99 is considered higher than 100?