If it took eight men ten hours to build a wall, how long would it take four men to build it?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Where do fish keep their money?

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?

What is the next number in the series?

15 29 56 108 208 ?

Can you count the number of lines in the below picture?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

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?

What breaks yet never falls, and what falls yet never breaks?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking