Can you make a tetrahedron whose faces all have the same perimeter?
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?
I am exactly n times my daughter's age. In m years I shall be ... How old am I?
My train left London between 6 a.m. and 7 a.m. and arrived in Paris between 9 a.m. and 10 a.m. I noticed that at the start and end of the journey the hands on my watch were in exactly the same positions but that the minute hand and hour hand had swapped places. What time exactly did the train leave London and how long did the journey take?