The dimensions of a certain machine are 48″ X 30″ X 52″. If the size of the mach

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The dimensions of a certain machine are 48″ X 30″ X 52″. If the size of the machine is increased proportionately until the sum of its dimensions equals 156″, what will be the increase in the shortest side?

A. 4
B. 7
C. 6
D. 5

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