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Given the ratios of junior to senior and senior to veteran members, can you work out what the smallest possible number of members in a swimming club is?

Weekly Problem 47 - 2017
How many numbers do I need in a list to have two squares, two primes and two cubes?

Charlie doesn't want his new house number to be divisible by 3 or 5. How many choices of house does he have?

When the numbers from 1 to 1000 are written on a blackboard, which digit appears the most number of times?

Weekly Problem 26 - 2015
What are the volume and surface area of this 'Cubo Vazado' or 'Emptied Cube'?

How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?