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03-11-2020
Mathematics

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A blue light flashes every 9 minutes and a red light flashes every 12 minutes. In how many minutes will they both flash?

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Susurrus Susurrus

03-11-2020

Answer:

36

Step-by-step explanation:

We need to find the LCM of both numbers. That is the least common multiple.

The prime factorization of [tex]9[/tex] is: [tex]3 * 3[/tex]. For [tex]12[/tex] it is [tex]2 * 2 * 3[/tex].

So we multiply: [tex]2 * 2 * 3 * 3 = 36[/tex]

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