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Two neon lights are turned on at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. In 60 seconds, how many times will they blink at the same time?
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Two neon lights are turned on at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. In 60 seconds, how many times will they blink at the same time?

User Krishnamurthy
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2 Answers

1 vote
You need to list multiples of 4 and 6 until 60. Find which multiples are shared, i.e. 12 is a multiple of 4 and 6. Count how many multiples are multiples of both 4 and 6. 
User YodagamaHeshan
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8.1k points
7 votes
4 will blink 15 times and 6 will blink 10. together they will blink 25 times
User ChuNan
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9.0k points
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