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PostPosted: Tue Jan 03, 2012 3:01 pm 
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Joined: Tue May 10, 2011 1:12 pm
Posts: 117
Could someone please help on this question?

Ladybirds eat greenfly.
On one bush, there are enough greenfly to feed 9 ladybirds for 4 hours.

a) How long would the greenfly last if there were only 6 ladybirds?

b) How many bushes would be needed to feed 36 ladybirds for 2 hours


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PostPosted: Tue Jan 03, 2012 4:16 pm 
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Joined: Mon Oct 10, 2011 6:00 pm
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just edited to delete my DS confusing post


Last edited by aargh on Tue Jan 03, 2012 5:24 pm, edited 1 time in total.

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PostPosted: Tue Jan 03, 2012 4:41 pm 
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Joined: Thu Feb 24, 2011 12:34 pm
Posts: 207
Won't it be 2 bushes for the second question.
1 bush = 9 lady birds for 4 hours = 18 lady birds for 2hours
Therefore, 2 bushes can feed 36 lady birds for 2hours.


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PostPosted: Tue Jan 03, 2012 5:22 pm 
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Well yes it will svg123
That rather confusing post above seems to have been posted by DS :roll: and he missed off his reason for the first answer.
I have had words with him about going on my forums :!: How do I delete it?


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PostPosted: Tue Jan 03, 2012 5:25 pm 
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Don't think you can delete a post completely. Editing it as you have done is best.


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PostPosted: Tue Jan 03, 2012 5:51 pm 
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a) One bush allows 9 ladybirds to eat for 4 hours.
That's 36 "eating hours" in total.
If there were only 6 ladybirds, then the 36 hours would last them 6 hours.

b) One bush lets 9 feed for 4 hours. Again, allowing 36 "eating hours"
This 36 hours from one bush should allow 18 to feed for 2 hours.
We need enough bushes for 36 ladybirds for 2 hours - so two bushes should be enough.

That's how I've worked it out - apologies if wrong!

=
ORIGINAL QUESTION BELOW
Ladybirds eat greenfly.
On one bush, there are enough greenfly to feed 9 ladybirds for 4 hours.
a) How long would the greenfly last if there were only 6 ladybirds?
b) How many bushes would be needed to feed 36 ladybirds for 2 hours


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