Posted by **Anonymous** on Saturday, April 21, 2012 at 10:10am.

The rate at which a rumor spreads through an Alpine village of 400 residents is jointly proportional to the number of residents who have heard it and the number who have not.

Initially, 5 residents heard the rumor, but 4 days later this number increased to 70 .

Find the number of people who will have heard the rumor after 2 wk.

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