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The Problem of the Fourth Week
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Two girls caught 25 frogs. Lisa caught four times as many as Jen did. How many frogs did Jen catch?
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Let X be what Jen caught. Therefore, Lisa caught 4X. Now as we know the two girls together caught 25.
Then X + 4X = 25    =>   
5X=25   =>  
X=5
=> Jen caught 5 frogs
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