SOLUTION: If one sack of rice can be consumed by 3 persons in 36 days, in how many days will 9 persons consume the sack of rice?

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Question 798511: If one sack of rice can be consumed by 3 persons in 36 days, in how many days will 9 persons consume the sack of rice?
Answer by josgarithmetic(39620) About Me  (Show Source):
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3 persons consuming the sack in 36 days would be same as a one person rate of 1 person in 3*36 days. This is 1%2F%283%2A36%29 sacks per day, or 1%2F108 sacks per day.

The rate then for 9 persons is 9%281%2F108%29=1%2F12 sacks per day.
This means 12 days for these 9 persons.