SOLUTION: four-fifth of the third grade went on a trip to the zoo. if 64 children made the trip,how many are in the third grade.

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Question 206550: four-fifth of the third grade went on a trip to the zoo. if 64 children made the trip,how many are in the third grade.
Answer by HyperBrain(694) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=number of students in the 3rd grade
Then 4x/5=number of students who attended the trip.
::
4x/5=64
Divide both sides by 4.
x/5=16
Multiply both sides by 5.
x=80
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HyperBrain!