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In response to "From B2: b. is too kind a grader. I would've docked you all for not showing your work. spoilers" by Oswaldo MoBarony

good job! Will showed part of his work. you made it way more complicated than I did, heh.

I pulled the page out of my recycling bin:

non-red gumballs = 12 + 11 + 7 = 30

30 = 1/3 of total, so 2/3 = 60

60-13 = 47


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