If we read the book at a speed of 15 pages a day, we read it 3 days before we read it at a speed of 10 pages per day. If I read at 6 pages per day, how many days will I read the book?

Result

x =  15 d

#### Solution:

$\ \\ n/15=n/10 - 3 \ \\ \ \\ n=90 \ \\ \ \\ n=90 \ \\ \ \\ x=n/6=90/6=15 \ \text{d}$

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