SOLUTION: Suppose your baby sister is born at 12 noon and you call 2 friends. In 10 minutes, they each call 2 friends to tell the news. In 10 minutes, these friends call 2 others each. This

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Question 614313: Suppose your baby sister is born at 12 noon and you call 2 friends. In 10 minutes, they each call 2 friends to tell the news. In 10 minutes, these friends call 2 others each. This continues all afternoon. How many people will know by 4:00 pm?
Found 2 solutions by richwmiller, josmiceli:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
the whole world and more.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The number of 10 minute periods in 4 hours
is +%28+4%2A60+%29+%2F+10+=+24+
The number of people who know is
+2%5E24+%2B+1+ and the 1 is yourself