The graph has two squares: 50 x 30 + (100-75) x 60 = 2 * 25 * 30 + 2 * 25 * 30 = 2 * ( 25 * 30 + 25 * 30) = 2 * (2 * 25 * 30) = 2 * 2 * 25 * 30 = 4 * 5 * 5 * 30 = 20 * 5 * 30 = 2 * 10 * 150 = 2 * 1500 = 3000.
(Of course this is a long way around of getting to the answer, but it kind of goes to show when you are working with more complicated numbers you can often break of the equation into more manageable numbers - or at least I find them that way - of lower multiples of 2’s, 5’s, 10’s, etc. to break the calculation into simpler parts in order to achieve an answer. As for removing the brackets in-between, in the real world that works just fine, and likely given that we are not dealing with any floating point numbers in this case a computer wouldn’t be able to tell the difference, but certain programs I have used have been known for not playing well with floating point numbers beyond certain decimal places - so just an issue to be aware of , though in those cases the computer would be doing the calculation for you so there’s no need to break things out this much in the first place).
right. You can definitely break things down to make things more manageable. The same could she said about any project you work on. Thank you for this post 