Here you are tested on the seventh day of the week for its month, and from that you can work out the day any date in that month will fall on. The seventh day will be the same day as every multiple of seven in that month; e.g. to work out the day 15th January 2018 will be, you know the 7th January is a Sunday and therefore so is the 14th, as it is a multiple of 7, and the 15th is one day after that so can be worked out to be on a Monday.
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