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Mathematics 13 Online
OpenStudy (anonymous):

a geologist collected 13 rocks that have exactly the same weight. if 9 of these rocks with an additional 5-ounce weight at one end of a balance -scale can balance the remaining rocks and a 23-ounce weight at the other end of a scale, what is the number of ounces in the weight of one if these rocks? include a let statement.

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