This puzzle stumped quite a few readers who wrote and asked for some extra clues. However, a second try and some rethinking helped and solutions and messages began to come in to us. The problem was very popular with our users who let us know that they found being able to place and move the numbers very helpful. One problem solver reported, "I really enjoy the interactive fun".
You could not assume that you had a line correct because one triangle filled with colour. To solve this problem you had to make sure all of the parts worked in conjunction with each other. There was more than one correct solution found. Two of them are below. There is a third solution that Emma found. Did anybody find any others?

This is the solution sent to us by Rebecca Sherwood, from Year 7 of The Mount School.

This is the solution found by Mithran Vyravipillai, from Melbourne Australia.