28/4 = 7 packs of notebokks total
7-3 = 4 packs are left
5y-10x=35 would be what I recommend
Answer:
Since 21 hundredths is 21over one hundred,21 hundredths as a Fraction is 21/100. If you divide 21 by one hundred you get 21 hundredths as a decimal which is 0.21. To get21 hundredths as a Percent, you multiply the decimal with 100 to get the answer of 20percent.
:) Well, I dunno about anyone else but this question makes my head spin!