<PRE><B>Question 815066</B>
It takes 3 people 4 hours to plant 12 trees
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If the same number of people plant for 1/4
of that time, they will plant 1/4 as many trees, so
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3 people take 1 hour to plant 3 trees
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1/3 as many people will plant 1/3 as many trees 
in the same amount of time, so
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1 person takes 1 hour to plant 1 tree 
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5 times as many people will plant 5 times as 
many trees in the same amount of time, so
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5 people take 1 hour to plant 5 trees
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The same number of people take 5 times as long
to plant 5 times as many trees, so
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5 people take 5 hours to plant 25 trees
 
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