There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

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

2, 3, 5, 9, 17, _ What is the next number in the sequence?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

who is silent in the parliament?

10+10 and 11+11 can give you the same answer.

Explain how?

What makes this number unique: 8,549,176,320?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

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?

How many triangles are there on the puzzle below?