I saw a question recently in the new AQA textbooks that got me very excited. The reason is that it is low entry. All these style questions can be solved with simple trial and error and some basic simplifying of ratio.
However, life is made a lot easier if you use normal techniques for dividing into a ratio. It is a real puzzle question which tests deep understanding of the work, whilst also offering an opportunity to at least have a go in some way. If this is the way GCSE's are going, then I can't wait!
Below are some extra extension questions I have made to have a go at too. They come with solutions :)