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  1. #1
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    story problem

    A virus scanning program is checking every file for viruses. It has completed checking 40% of the files in 300 seconds. How long should it take
    to check all the files?


    I think the answer is 420 second: 300 + 40% = 420

    Can someone show me how to set up this proportion?
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  2. #2
    Eater of Worlds
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    300 is 40% of what?.

    300=0.4x
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  3. #3
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    Quote Originally Posted by Patience View Post
    A virus scanning program is checking every file for viruses. It has completed checking 40% of the files in 300 seconds. How long should it take
    to check all the files?


    I think the answer is 420 second: 300 + 40% = 420

    Can someone show me how to set up this proportion?
    \frac{40}{100} = \frac{300 \, s}{t}

    So after cross-multiplying:
    t = \frac{100}{40} \cdot (300 \, s) = 750 \, s

    -Dan
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