What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

I have branches, but no fruit, trunk or leaves. What am I?

Can you find out which options fits best with the missing column?

The king of Octopuses has servants who have six, seven or eight legs. The distinguishing characteristics of the servants is that the one with seven legs always lie but the one with either six or eight legs speak the truth always.

One day, four servants meet and converse:

The black one says, 'We have 28 legs altogether.'

The green one says, 'We have 27 legs altogether.'

The yellow one says, 'We have 26 legs altogether.'

The red one says, 'We have 25 legs altogether.'


Can you identify the colour of the servant who is speaking the truth?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

When is the top of a mountain similar to a savings account?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What has no start, end, or centre?