**Math Riddles**

- The fishing trip.
- The age of the three children.
- The number of pineapples.
- The age of the niece.
- The cost of the clothes.
- The farmer and the rock.
- The missing dollar.
- Integer sequence.
- The three jugs.
- The three builders.
- The age of Frank and his sister.
- The freight train and the passenger train.
- The population of the towns.
- The number of chickens and ducks.
- What number am I?
- Find the numbers.
- Letter sequence.