I'll give it a go... The following question/explanation is taken from the Bond - How to do 11+ verbal reasoning:
Adam, Daniel, Matthew, Ranjna and Sarah are 10,9,8,7 and 6 years old but not in that order. Who is the youngest?
Sarah is one year younger than Ranjna.
Adam is older than Daniel.
Matthew is two years younger than Ranjna.
Daniel is two years younger than Matthew.
So: Draw a grid showing the names of the children and the age range.
Extract the maximum amount of information from each statement before moving on.
Remember you only need to find the answer to the question - don't get distracted by trying to fill in the whole grid.
Sarah Ranjna Adam Daniel Matthew
I've not put in the crosses (as i can't get the grid to work properly) but from the first statement, Sarah is one year younger than Ranjna - Sarah can't be 10 and Ranjna can't be 6, so a cross will go by Sarah/age 10 and Ranjna/age 6. By working through each statement, Daniel is the youngest as he is the only one that doesn't end up with a X in the age 6 row.
Hope this makes sense, The question is pretty complicated but I think it illustrates the process of working it out quite well.