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

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

In the image below, can you find the value of an angle(y)

Can you find out which options fits best with the missing column?

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

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

What has a ring but no finger?