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Norrie sees two lights flash at the same time, then one of them flashes every 4th...

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Basic Math

Norrie sees two lights flash at the same time, then oneof them flashes every 4th second, and the other flashes every 5thsecond. How many times do they flash together during a wholeminute?

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Let us assume Norrie sees two lights flash at the same time attime0 secFrequency of first flash I Every 4th secondFrequency of second flash II Every 5th secondLet us    See Answer
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