What always comes into a house through the keyhole?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

If 21x = 79x, what is the value of x?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

What does this simple rebus mean?

We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

What is wrong in the below Picture?