Count the number of triangles in the picture below:

A farmer went to a market and bought a wolf, a goat, and a cabbage. On his way home, the farmer came to the bank of a river and rented a boat. But crossing the river by boat, the farmer could carry only himself and a single one of his purchases: the wolf, the goat, or the cabbage. If left unattended together, the wolf would eat the goat, or the goat would eat the cabbage. The farmer’s challenge was to carry himself and his purchases to the far bank of the river, leaving each purchase intact. How did he do it?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

What occurs twice in a week, once in a year but never in a day?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What four weights can be used to balance from 1 to 30 pounds?

How many letters are in the alphabet?