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

What can you hold in your right hand, but never in your left hand?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

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

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Give it food and it will live; give it water and it will die.

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?