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6 June, 10:15

Craig Campanella and Edie Hall both have night jobs. Craig has every thirteenth night and Edie has every Fifth night off. How often will they have same night off?

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  1. 6 June, 10:25
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    Craig has every 13th night and Edie has every 5th night off.

    You have to find LCM - the Least Common Multiple that is the smallest ("least") number that both 13 and 5 will divide into.

    Since numbers 13 and 5 are both prime, then LCM (13,5) = 13·5=65.

    This means, they will have the same every 65th night off.
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Home » Mathematics » Craig Campanella and Edie Hall both have night jobs. Craig has every thirteenth night and Edie has every Fifth night off. How often will they have same night off?
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