Book reading

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?

Correct result:

x =  15 d

Solution:

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

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