Can you find out the total number of triangles in the given figure?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

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

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Who is that with a neck and no head, two arms and no hands? What is it?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?