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:

 n/15=n/103  n=90  x=n/6=90/6=15 d



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