Two halves of one day together are equivalent to one day, then we can express the ratio of half days to a day like this:
[tex]\frac{\text{halfs of a day}}{day}=\frac{2}{1}[/tex]
Then, to find how many groups of half-days are in seven days (one week) we just have to multiply the number of days (7) by the ratio expressed above, like this:
[tex]7\times\frac{2}{1}=7\times2=14[/tex]
Then, there are 14 groups of 1/2 days in a week
