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

How is this possible?

Next Number in the Series,

5, 16, 49, 104, ?

Find the next number in the series.
1 10 24 43 67 ?

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?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Can you fill the blank with the correct number?

6 30 870 756030 _____

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

Replace the question mark with the correct number in below Picture:

Can you count the number of triangles inside a triangle?

What has a ring but no finger?