It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Can you solve this picture maths equation?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Through your logical capabilities, can you make 7 an even?

You need to move three matchsticks to form three squares. Can you do it?

Which Burger Is Different in below image?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

What do you answer even though it never asks you questions?

Our product and our sum always give the same answer. Who are we?