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15 December, 03:02

A red blinking light blinks every 18 seconds, while a yellow blinking light blinks every 12 seconds. If both lights start at the same time, after how many seconds will they next blink at the same time? A) 6 B) 18 C) 36 D) 54

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  1. 15 December, 03:50
    0
    Least common multiple because that's when the numbers meet ... so the answer is C.
  2. 15 December, 05:34
    0
    Option C, 36, because it is the LCM (Least common multiple)
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