Remove two matchsticks to make the below equation correct.

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

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

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

In the image given, you can find several triangles. Can you count them all?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

How many triangles are there in the picture below?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?