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

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

How many bananas can you eat if your stomach is empty?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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?

Can you find out the remainder when 3^300 is divided by 5?

When is the top of a mountain similar to a savings account?

What is the next number in the series?

15 29 56 108 208 ?