Calculated 8085

Roza calculated that if she read ten pages a day, she would read the whole book in 18 days. After a week, however, she decided to read one more page a day. How many days will he read the entire book?

Correct answer:

d =  17

Step-by-step explanation:


10·18 = 7·10+(10+1)·(d-7)

11d = 187


d = 187/11 = 17

d = 17

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