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Math Help - One spider ... two spiders.

  1. #1
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    Thumbs up One spider ... two spiders.

    A spider takes 30 days to weave its web, weaving day after day exactly double as much it weaved the day before.

    Starting at the first day with two spiders that behave the same way and they weave twice as much as they did in the previous day.

    In how many days would the two spiders weave the total sum weaved by a single spider in 30 days?
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  2. #2
    Member Glaysher's Avatar
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    Quote Originally Posted by cmart022 View Post
    A spider takes 30 days to weave its web, weaving day after day exactly double as much it weaved the day before.

    Starting at the first day with two spiders that behave the same way and they weave twice as much as they did in the previous day.

    In how many days would the two spiders weave the total sum weaved by a single spider in 30 days?
    One spider

    1 + 2 + 4 + ... + 2^29

    Two spiders

    2 + 4 + 8 + ...

    Start of 30th day to get the missing 1
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