Or search by topic
A, B & C own a half, a third and a sixth of a coin collection. Each grab some coins, return some, then share equally what they had put back, finishing with their own share. How rich are they?
Given an equilateral triangle inside an isosceles triangle, can you find a relationship between the angles?
A mother wants to share a sum of money by giving each of her children in turn a lump sum plus a fraction of the remainder. How can she do this in order to share the money out equally?
A simple method of defining the coefficients in the equations of chemical reactions with the help of a system of linear algebraic equations.
Consider a watch face which has identical hands and identical marks for the hours. It is opposite to a mirror. When is the time as read direct and in the mirror exactly the same between 6 and 7?
One night two candles were lit. Can you work out how long each candle was originally?