Can you place six X (crosses) in below board without making three in a row in any way ?

Can you count the number of triangles in the given picture?

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?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Take away the whole and some still remain. What is it?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Why is the Hole below a Lock?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.