What is black when you buy it, red when you use it, and gray when you throw it away?

A man dies of old age on his 25 birthday. How is this possible?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

What runs around the whole yard without moving?

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.

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

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?

Solve the rebus riddle in the picture below.