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PostPosted: Tue Mar 24, 2020 10:29 am 
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Joined: Thu Oct 18, 2012 9:41 am
Posts: 472
The number of insects in a colony doubles each week. If there were 100 insects in the colony at the start of the first week,

(a) how many would there be after 6 weeks ?

Confused as to whether the answer is 3200 in the 6th week or 6400 at the start of the 7th week. With the wording saying after 6 weeks, I'm not sure which one it would be :?:

thanks in advance
SleepyH


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PostPosted: Tue Mar 24, 2020 10:50 am 
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Joined: Wed May 09, 2007 2:09 pm
Posts: 1193
Location: Solihull, West Midlands
Badly worded, but "after six weeks" implies six lots of doubling so I would go for 6400

https://pbs.twimg.com/media/ETwOmI6XYAA8C2k.jpg


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PostPosted: Tue Mar 24, 2020 11:57 am 
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Joined: Thu Oct 18, 2012 9:41 am
Posts: 472
Thank you :)


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PostPosted: Thu Mar 26, 2020 1:32 pm 
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Joined: Fri Mar 10, 2017 4:06 pm
Posts: 681
It depends on in which week the insects are told to self isolate...(and whether or not they take any notice) :wink:

(in answer to your question I would agree that its 6400. 'After 1 week' it would be 200, not still 100. After 2 weeks 400 etc)


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