Question

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9) Stoplight A turns red every 14 seconds. Stoplight B turns red every 6 seconds.
When will they both be red at the same time?​

Answer 1

Respuesta:

At 42 seconds.

Explicación paso a paso:

Turns out they match un the 3rd red turning for A and the 7th for B.

That isn't the only time they match, you can actually present a function that tells you when they will match, which is:

14 seconds, x number of times will be the same as 6 seconds y number of times $14x = 6y$ which simplifies to $y = \frac{14}{6}x$ and there, you can input one and solve for the other, on the condition that they have yo be integers to describe the seconds.