John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Can you make four (4) nines (9) equal 100?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Which is the correct shadow of the bird?

O_er_t_o_

Complete the missing letters of the given word.

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

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

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?