Every day 7 pages

Anelka reads the book seven pages every day. When she reads one more page a day, she will read it three days earlier. How long will Adelka read a book? How much does a book of pages have?

Correct answer:

d =  24 d
s =  168

Step-by-step explanation:


7d = s
(7+1)·(d-3) = s

7·d = s
(7+1)·(d-3) = s

7d-s = 0
8d-s = 24

Pivot: Row 1 ↔ Row 2
8d-s = 24
7d-s = 0

Row 2 - 7/8 · Row 1 → Row 2
8d-s = 24
-0.13s = -21


s = -21/-0.125 = 168
d = 24+s/8 = 24+168/8 = 24

d = 24
s = 168

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