Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

I travel all around the world but always stay in the corner. What am I?

What is harder to catch the faster you run?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

How can you tell a raw egg from a hard-boiled egg?

Replace the question mark with the number below given a simple math problem.

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?