Pages of book

Lenka calculated that if every day read 16 pages of the book, and read a book a day earlier, then she had read only 14 pages a day. How many pages has this book?

Correct answer:

n =  112

Step-by-step explanation:


16(d-1) = n
14 d = n

16·(d-1) = n
14·d = n

16d-n = 16
14d-n = 0

Row 2 - 14/16 · Row 1 → Row 2
16d-n = 16
-0.13n = -14


n = -14/-0.125 = 112
d = 16+n/16 = 16+112/16 = 8

d = 8
n = 112

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