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30 August, 12:50

A green light blinks every 4 seconds and a yellow light blinks every 5 seconds. At how many seconds will the lights first blink at the same time?

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  1. 30 August, 13:13
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    20 seconds

    Step-by-step explanation:

    The least common multiple of 4 and 5 is 20. So the two lights will blink at the same time every 20 seconds.
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