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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+6 bolts per hour. In terms of x, how many bolts can both machines working together at their respective rates produce in 4 hours?
(A) (4x)+12
(B) (4x)+24
(C) (6x)+30
(D) (8x)+24
(E) (8x)+36
