Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Count the number of lines in the image below ?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

You need to move three matchsticks to form three squares. Can you do it?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What does the below image rebus riddle means ?