Mathematics
badboy

A lumberman stacks planks of wood, starting with 30 planks in a row. Each row he stacks has one less plank than the row below it. The last row he stacks has 15 planks. How many rows of planks has he stacked?

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(1) Answers
janetboyd555

16                                                                        trust me its 16 !!!!!!!!!!!!!!!!

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