a light flashes every 2 minutes, a second light flashes every 3.5 minutes and a third light flashes every 4 minutes. if all three lights flash together at 8 p.m what us the next time of the day they will all flash together

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28-10-2014
Mathematics

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a light flashes every 2 minutes, a second light flashes every 3.5 minutes and a third light flashes every 4 minutes. if all three lights flash together at 8 p.m what us the next time of the day they will all flash together

Sagot :

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paulcox paulcox · Answer 1 · 2014-10-28T20:00:41-04:00

paulcox paulcox

28-10-2014

take the LCM of the three numbers. Since 2 is a multiple of 4, you can ignore the two and just take the LCM of 4 and 3.5. Since 3.5 is a decimal, the LCM is just 3.5*4 which is 14. That is how many minutes after 8:00 they will flash together again.

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