Asked by Jay
A library opens with a collection of 300 books. During the first week after
the opening, an additional ten books are donated to the library’s
collection. In each subsequent week, six more books are donated to the
library’s collection than were donated in the previous week. Work out how
many books are in the library’s collection after twenty weeks.
the opening, an additional ten books are donated to the library’s
collection. In each subsequent week, six more books are donated to the
library’s collection than were donated in the previous week. Work out how
many books are in the library’s collection after twenty weeks.
Answers
Answered by
Steve
300+10+16+22+...
= 310 + 19/2 (2*16 + 18*6)
= 1640
= 310 + 19/2 (2*16 + 18*6)
= 1640
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