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please help #9

Guide :Elementary School

please help #9

Please help #9 Cindy decorates her house with three strands of holiday lightsred blinks every 4 secgreen blinks every 6 secswhite blinks 10 every 10 secshow many secs will go by until the 3 strands bl
It would take about 30sec for all of the lights to go at the same time ...

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