Fun Brain Teasers for Kids

The Missing Dollar:

Three friends decide to split the cost of a $30 hotel room. Each of them contributes $10, making a total of $30. Later, the hotel clerk realizes that there was a mistake, and the room only cost $25. The clerk gives the bellboy $5 to return to the friends. However, the bellboy decides to keep $2 for himself and gives $1 back to each friend. Now, each friend has paid $9 (a total of $27), and the bellboy has kept $2. That makes $29. What happened to the missing dollar?

The Age Riddle:

A father says to his son, “Ten years ago, I was twice your age.” How old is the father now if the son is currently 20 years old?

The Half-Price Sale:

During a half-price sale, a toy’s price is reduced by 50%. After the sale, the price of the toy goes back to its original price. What percentage increase is this?

The Farmer’s Chickens and Rabbits:

A farmer has 30 animals on his farm, which are a mix of chickens and rabbits. He counts a total of 82 legs among all the animals. How many chickens and rabbits does he have?