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340 it also took me a while to understand but once you get the hang of it, it gets much easier. make sure you know your solutions!
You need to add all the areas of different bits. So the triangle is 8x4/2 times 2 because there is two of them. You add the back which is 20x8. You add the bottom which is 15x20. You add the slant which is 17x20. This gives you 832.

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