Susan thought, "If I read 15 pages a day, I will read the whole book in 8 days. “How many pages would she have to read a day if she wanted to finish the book on the 6th day from the start of reading? And how many pages does the book have?

Correct result:

n =  120
d =  20

Solution:

$d=n\mathrm{/}6=120\mathrm{/}6=20$

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