# 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?

# Dots and lines - logic puzzle

Can you connect all nine dots with only four straight line segments without losing contact with the paper while drawing? |

# A true mystery - logic puzzle

The pieces with the same color in left figure have the same size as in the ones in the right figure. In the right image the pieces are only ordered differently. How to explain the hole in the right image?