Singapore Math - Algebraic Reasoning Part 2

[requirementforadream]

Need to elaborate more that the reason you add 188 and 72 is because you want to imagine that you have 2 full bars of the same length to find out how long one bar is. With the smaller bar at the current length, you only get 188. But if you add that 72 and make the bars equal to each other, you get 2 FULL bars of similar length and they add up to 260. Since you made the bars equal to each other and add up to 260, you could divide the bars in half, and you'd find the length of one bar...etc.

[requirementforadream]

You don't really explain well why you would add 188 and 72