teniedavis58 teniedavis58

30-08-2022
Mathematics

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Two neon lights are turned on at the same time. One blinks every 3 seconds and the other blinks every 7 seconds. In how many seconds will they blink at the same time?

Respuesta :

rmfournier rmfournier

30-08-2022

Answer: 21 seconds

Step-by-step explanation:

The multiples of three in order are:

3, 6, 9, 12, 15, 18, 21

The multiples of 7 in order are:

7, 14, 21

So the lights would blink at the same time in 21 seconds

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