To find out how many knots (or, more accurately, how many reading sessions of 60 pages each) it will take Mate to finish his book, we can follow these steps:
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Determine the number of pages left to read: \[ \text{Total pages} - \text{Pages read} = 520 - 100 = 420 \text{ pages remaining} \]
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Calculate how many sessions of 60 pages it will take to read the remaining pages: \[ \text{Number of sessions} = \frac{\text{Pages remaining}}{\text{Pages per session}} = \frac{420}{60} = 7 \text{ sessions} \]
So, it will take Mate 7 sessions of reading 60 pages each to finish his book.