How many triangles are there on the puzzle below?

How many times do a clock's hands overlap in a day ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

If we tie a Sheep to one peg, a circled grass is been eaten by the Sheep. If we tie the Sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the Sheep. If we want an eclipse then we put two pegs and then put a rope in between them and the other end of the rope is tied up on the Sheep's neck.

How should we tie the peg and the Sheep so that a square is eaten out from the garden grass? We only have one Sheep rope and the peg and the rings.

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?