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 word begins and ends with an E, but has only one letter?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?