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Max have 6 rolls of wire  9 2/5  per roll and 7 rolls 16 3/4 per roll wire do they...

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hljamesjr | Student, Undergraduate | eNotes Newbie

Posted September 16, 2010 at 8:15 AM via web

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Max have 6 rolls of wire  9 2/5  per roll and 7 rolls 16 3/4 per roll wire do they need  in order to do a job if it requires 220 ft of wire   

Max has 6 rolls of wire 9 2/5 ft per roll and 7 rolls 16 3/4 ft per roll. Does he have enough wire to complete a 220 Ft project?

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hustoncmk | High School Teacher | (Level 1) Assistant Educator

Posted September 17, 2010 at 4:32 AM (Answer #1)

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The first thing you need to do with any word problem is make sure that you fully understand what is being asked.  I have edited your question to be what I believe you were trying to ask. Reread the problem and make sure that I have correctly interpreted your question.

In this problem you can start with an estimate because you are being asked if you have enough, not for an exact amount. If you begin with front end estimation, which would be just look at the whole numbers you would have the following:

 6 rolls times 9 feet + 7 rolls times 16 feet

54 feet + 112 feet

166 feet

If the problem is supposed to be asking how much more wire you will need, then you need to calculate exact amounts.

6 x 9 2/5 + 7 x 16 3/4 = 56 2/5 + 117 1/4 = 56 8/20 + 117 5/20 = 173 13/20 feet

Total you need is 220 feet  220 - 173 13/20 = 46 7/20 additional feet of wire needed

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