If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

What does this mathematical rebus means ?

What's the only room from which no one can enter or leave

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

Which is the rope you never skip with?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?