What's the best place to go shopping in the ocean?

What is always in front of you but can’t be seen?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Who always enjoys poor health?

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?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

What does this rebus riddle means ?