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Math Help - Easy question

  1. #1
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    Easy question

    I just need to solve this with explenation, and i think that i am right and my book is wrong just want to verify


    An elastic is stretched by 86% to a length of 5.8 m. Calculate the original length.
    Thanks
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by shanerocks View Post
    I just need to solve this with explenation, and i think that i am right and my book is wrong just want to verify


    An elastic is stretched by 86% to a length of 5.8 m. Calculate the original length.
    Thanks
    Let the original length be x

    We have 1.86x = 5.8 \mbox { m }

    \Rightarrow x = \frac {5.8 \mbox { m }}{1.86}

    \Rightarrow x = 3.12 \mbox { m }
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  3. #3
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    thanks, why is it 1.86
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by shanerocks View Post
    thanks, why is it 1.86
    i wrote the percentage as a fraction. the original length is 100%, written as a decimal, that is 1. then we stretch it by 86%, that is, 0.86. so the new length will be 1 + 0.86 times the old length, or 1.86 times the old length, since 1.86 mean 186%

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