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Mathematics > Standard Multiple Choice

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

Machine X, working at a constant rate, can produce x bolts per hour. Machine Y, working at a constant rate, can produce x plus 6 bolts per hour. In terms of x, how many bolts can both machines working together at their respective rates produce in 4 hours?

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The number of bolts both machines working together at their respective rates can produce in one hour is the sum of the numbers each machine working alone can produce in one hour.

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