Prove that the below maths equation is true.

8 + 8 = 91

What number divided by 4 is the same as that number minus 4?

The centre of the third figure is empty. What digit should fit inside?

Solve this riddle by finding the odd one out from the rest.

What word is represented by this rebus?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

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

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.