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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer. 

A geologist has 10 rocks of equal weight. If 6 rocks and a 10-ounce weight balance on a scale with 4 rocks and a 22-ounce weight, what is the weight, in ounces, of one of these rocks?

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If r is the weight of one rock, then the weight of 6 rocks and a 10-ounce weight can be written as (6 times r) + 10, and the weight of 4 rocks and a 22-ounce weight can be written as (4 times r) plus 22. Since the two sides balance, these weights are equal.

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