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2 years ago

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

Mathematics

1 answer:

mote1985 [20]2 years ago

3 0

Answer:

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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