Readers borrowed a total of 220 books in the library during the first three days. On the second day, readers borrowed half as many books as the first day and at the same time 20 fewer books than the third day. Depending on the quantity x, express the number of books that readers borrowed the next day. .. . Depending on the quantity x, express the number of books that readers borrowed on the third day. .. .. Calculate how many books readers borrowed on the first day

Correct result:

x =  80
a =  40
c =  100


 220=(xx/2)+x+(x+20)  5x=400  x=80

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