Problem of the Week (41)
Chloé chooses a real number uniformly at random from the interval . Independently, Laurent chooses a real number uniformly at random…
Problem of the Week (36)
In the tribe of Zimmer, being able to hike long distances and knowing the roads through the forest are both…
Problem of the Week (35)
This an incredible problem—incredible because it seems to lack sufficient data for a solution. A cylindrical hole six inches long…
Problem of the Week (31)
Four golf balls can be placed so that each ball touches the other three. Five £1 pound coins can be…
Problem of the Week (26)
Donald draws ten mathematical objects that can be labelled from . He puts them into a natural sequence as follows:…
Problem of the Week (10)
You have ten bags – each bag has ten coins (weighing 1g each), however, one bag contains fake coins (weighing…
Problem of the Week (8)
AN OLD RIDDLE runs as follows. An explorer walks one mile due south, turns and walks one mile due east,…
Problem of the Week (7)
A monk climbs a mountain. He starts at 8AM and reaches the summit at noon. He spends the night on…
Problem of the Week (6)
There are three on/off switches on the ground floor of a building. Only one operates a single lightbulb on the…
Problem of the Week (5)
Divide the following region into 4 congruent shapes (the shape is created by joining 3 congruent squares) (Credits to IMOmath)…