If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

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

Why do we preferably have round manhole covers and not square ones?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

What do you see in the image below

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?