You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

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?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Can you make a six-letter word using the letters N, A and B ?