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13 October, 11:47

Marys watch keeps perfect time and Bills watch loses 4 minutes a day.

Both watches are set at midnight on January 1. How many times a year will they match?

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  1. 13 October, 15:42
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    Three times a year because every 144 days Bill's watch will loop. This is proven by the fact that of course 60*24 equals 1,440 and if we divide by 10 (because it's ten minutes and not one) we get 144 and 144*2 equals 288 but 144*3 equals 432 which would go over one year so it will loop two times plus the start of the year making three
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