Singapore does use a certain approach to solving certain kinds of problems called the "Singapore Model Method" which is fairly simple but might be unfamiliar at first. Some of the CWP problems in the later grades lend themselves to solution using the method and might be more challenging if you don't know it.

Look at the Chapter 2 samples from CWP4 for an example:
http://www.singaporemath.com/Challenging_Word_Prob_for_Primary_Mathematics_4_p/pmcwp4.htm