One night two candles were lit. Can you work out how long each candle was originally?
A simple method of defining the coefficients in the equations of chemical reactions with the help of a system of linear algebraic equations.
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?
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?
Given an equilateral triangle inside an isosceles triangle, can you find a relationship between the angles?
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?