Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

With the help clues provided in the image, can you find the 5 digit key?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

What occurs twice in a week, once in a year but never in a day?

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

ST ND RD TH '?'

What is the coolest letter in the alphabet?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

Why do we preferably have round manhole covers and not square ones?