Why do this
can be solved by either trial and improvement or, more formally, by
making a set of two simultaneous equations. For this reason, it
could be used as a method of introducing or revising simultaneous
How are you going to work on this? Are you going to use trial
and improvement or try to make a set of simultaneous
Would a number line for the children's ages help you?
Would it be useful to write the initial information as
Can you get two equations involving just two of the
Whose ages are even and whose odd?
What combinations are possible for Tom's and Sally's
Why not try a number or Tom's age and see how it works
Learners could go on to a similar problem such as Thasan's
Suggest jotting down the useful information a number line for the