vickWgaplezBgu vickWgaplezBgu

31-07-2016
Mathematics

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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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texaschic101 texaschic101

31-07-2016

4,8,12,16,20,24,28,32,36,40,44,48,52,56,60
6,12,18,24,30,36,42,48,54,60

common numbers are : 12,24,36,48,60....5 numbers...they will blink 5 times ,at the same time, in 60 seconds

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