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

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

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

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What does a man do only once in his lifetime, but women do once a year after they are 29?

What's a single-digit number with no value?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

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