If 1+9+8=1, what is 2+8+9?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Decode below three cipher riddles:

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

In the image given, you can find several triangles. Can you count them all?

By what process could you make a 'Tea-Table' into food?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?