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Building Tetrahedra

Can you make a tetrahedron whose faces all have the same perimeter?

Rudolff's Problem

A group of 20 people pay a total of £20 to see an exhibition. The admission price is £3 for men, £2 for women and 50p for children. How many men, women and children are there in the group?

Our Ages

I am exactly n times my daughter's age. In m years I shall be ... How old am I?

Deep Roots

Age 14 to 16
Challenge Level

No one managed to solve this problem this month. We will put it into "Tough Nuts".