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How do you do this question?

How do you do this question?-example-1
User Dan Largo
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He would need 9 more wood cubes. Because for p4 he added 5 cubes which equaled 15 overall now, for p5 he needs to add 6 more to this number. 15+6=21. If he has 12 left, he needs 9 more cubes to make it equal to 21.
User Alfredo Osorio
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