Count the squares in the matchstick puzzle below?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Replace the question mark with the correct number below.

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

Can you spot the man between the coffee bean in the picture below ?

What can you deduce from the following BrainBat?

CRY
LMKI

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Spot 5 differences in two Christmas tree below: