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27 May, 16:10

If a green light blinks every 4 seconds and a yellow light blinks every 5 seconds. When will both lights blink at the same time?

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Answers (2)
  1. 27 May, 17:08
    0
    Answer:20 seconds

    Step-by-step explanation:

    4=4,8,12,16,20

    5=5,10,15,20
  2. 27 May, 18:25
    0
    20 seconds

    Step-by-step explanation:

    i think this is right
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