Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

How is the moon similar to a dollar?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

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

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.