Problem 9

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Problem 9
Splitting Logs By (Names erased)
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Overveiw

• State Problem
• What we know
• Procedure
• Answer
• You try one

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Problem 9

• Jeff has a pile of 250 logs that must be split.

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• He and four friends were able to split 100 of
  them in two and a half hours on Monday.

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• The following day he and two friends decided to
  finish the job.

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• How long did it take them to complete the job?

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What we Know

• 250 logs that must be split
• Four friends split 100 logs in two and half hours
• Three friends want to split the remaining logs.

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What we need to Know

• Remaining logs to split
• How long it took to complete the job

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procedure

• 5 people 3 people
• 100 logs x logs
• 5x 300
• x 60 logs

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procedure

• Remaining logs to split
• 250 - 100 150 logs
• (Starting logs-number split first day)

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procedure

• 60 logs 150 logs
• 2.5 hours x hours
• 60x 375
• x 6.25 hours
• or
• 6 hours 15 min.

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Answer

• It take the three friends 6 hours 15 minutes to
  complete splitting the logs.

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You try one

• You are trying to move 210 boxes. Two friends
  helped you move 90 of the boxes in two hours. One
  friend comes back the next day to help you move
  the rest. How long does it Take?

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solution

• 3 people 2 people
• 90 boxes x boxes
• 3x 180
• x 60 boxes

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• Remaining boxes to move
• 210 - 90 120 boxes

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• 60 boxes 120 Boxes
• 2 hours x hours
• 60x 240
• x 4 hours

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Answer

• It takes 4 hours to move the remaining boxes.