breemills9953
07.09.2021 •
Mathematics
The digital root of the year 2007 is 2 + 0 + 0 + 7 = 9, which is a squarenumber.How many years during the twenty-first century (2001 – 2100) have asquare digital root?
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Ответ:
So we know that Kenzi 15 bracelets a week. And the question is asking how long it takes to make 105 bracelets. So we divide the amount we want (105) by the amount he can make per week (15):
105 / 15 = 7
It takes Kenzi 7 weeks to make 105 bracelets.