Can you solve the photo plexer logic ?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Before Mount Everest was discovered, what was the highest mountain in the world?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Move three sticks of the spiral below to form a square.