The “Open” sign at Cenzo’s flashes every 4 seconds. The “Open” sign at The Kettle flashes every 5 seconds and the “Welcome” sign at Centrell

Question

The “Open” sign at Cenzo’s flashes every 4 seconds. The “Open” sign at The Kettle flashes every 5 seconds and the “Welcome” sign at Centrella’s Deli flashes every 6 seconds. If the signs are turned on and flash at the same time, how long will it take for them to flash at the same time again?

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Sapo 4 years 2021-08-27T12:50:29+00:00 1 Answers 8 views 0

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  1. Thunguyet
    0
    2021-08-27T12:52:27+00:00
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    It will take 60 ( one minute) for the signs to flash at the same time

    Find the lcm ( least common denominator)
    4: 4,8,12,16,20,24,28,32,36,40,44,48,52,
    56,60
    5: 5,10,15,20,25,30,35,40,45,50,55,60
    6: 6,12,18,24,30,36,42,48,54,60

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