You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

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?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

If you say my name, I will no longer exist. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

I know a nine-letter word having only one vowel.
Do you ?

Can you solve this picture maths equation?

Why 1729 is a magic number? Answer Logically.