# Rowing - logic puzzle

1

11

21

1211

111221

312211

13112221

What number comes in the next row?

11

21

1211

111221

312211

13112221

What number comes in the next row?

# Billiard-balls - logic puzzle

Nine billiard-balls are lying in front of you. Except for one they all have the same weight. The exception is a little bit heavier than the others. What is the minimal number of times you have to use a balance in order to find the wrong billiard ball? |

# Letter math - math puzzle

A - B = B

B * C = A

D : B = E

C * C = E

C + E = A

For which numbers stand A, B, C, D and E?