81 x 9 = 801. What must you do to make the this equation true?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

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

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

What does this rebus puzzle means ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

There is something which you can be arrested for attempting but not for successfully completing.

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?