The methods have a lot in common, and they differ mainly in the form of presentation. However, standard Bar modelling is impractical under high-stakes high-stress examination conditions for this problem, not least because one would have to cut the bars into many pieces. One should not cut off one’s feet just so as to fit the shoes (削足适履), as one Chinese saying goes. We need to be flexible and open-minded. I present a solution using my own Distinguished Ratio Units.
Next, we add on the 2 and 3 “triangle” units. By doing a comparison, we can figure out that 1 “triangle” unit must be 45 more than 17 “heart” units. So 2 “triangle” units must be equal to 34 “heart” units plus 90. Replacing the 2 “triangle” units (shown in yellow) with their equivalent, we now know that 59 “heart” units plus 90 gives 444. This allows us to figure out that 1 “heart” is actually 6. Thus, we can work out what 1 “triangle” unit, and then what 5 “triangle” units are worth.