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On cutting which solid parabola would be generated

In a sports contest there were m medals awarded on n
successive days (n > 1).
1. On the first day 1 medal and 1/7 of the remaining
m – 1 medals were awarded.
2. On the second day 2 medals and 1/7 of the now
remaining medals was awarded; and so on.
3. On the nth and last day, the remaining n medals
were awarded.
How many days did the contest last, and how many medals
were awarded altogether?

A can copy 50 papers in 10 hours while both A & B can copy
70 papers in 10 hours. Then for how many hours
required for B to copy 26 papers?

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