what is the LCD of 1/6 and 3/10

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The LCD is 30. Think of it this way.  You and I are on an assembly line checking i-pads.  Your job is to quality check every 6th one and my job is to check every 10th one. Here are the ones you will check: 6, 12, 18, 24, 30 and so on Here are the ones I will check 10, 20 30 and so on. Notice the first one we both check?  #30 - that is the LCD of 6 and 10

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