What goes up but never comes down?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

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

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I always drive my customer away.

Who am I?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

Can you find the hidden animal in the picture below?

Find the hidden tiger in the given optical illusion ?

If two's company, and three's a crowd, then whats four and five ?