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18 December, 20:21

A red light blinks every 12 seconds and a blue light blinks every 9 seconds. When will both lights blink at the same time?

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  1. 18 December, 20:23
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    36

    Step-by-step explanation:

    We need to find the LCM of the two numbers because we need to know the lowest number that 12 and 9 are both in.

    12 * 1 = 12

    12 * 2 = 24

    12 * 3 = 36

    12 * 4 = 48

    9 * 1 = 9

    9 * 2 = 18

    9 * 3 = 27

    9 * 4 = 36

    We can see that 36 is the lowest number that occurs both in 12 and 9 so the blue and red light will both link at 36 seconds
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