Liam saw an unusual clock in the museum: the clock had no digits, and it’s not clear how the clock should be rotated. That is, we know that
Two circles are tangent to each other and the smaller circle with the center
For positive real numbers
Let
Due to a mistake in the bakery, a cake that was supposed to be shaped as two concentric pieces (like on the right diagram below) came out like the left diagram below. Find the smallest number of pieces the cake should be cut into in order to rearrange the pieces into the cake on the right side of the picture.
Note that the cake is
Katie and Charlotte had
There is a scout group where some of the members know each other. Amongst any four members there is at least one of them who knows the other three. Prove that there is at least one member who knows the entirety of the scout group.
The distance between two villages equals
Two players are playing a game. The first player is thinking of a finite sequence of positive integers
The letters
Find