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OpenStudy (selena2345):
A virus scanning program is checking every computer file for malware.It checked 30% of the files in 240 seconds. At this rate, how long should it take to check all the files ?
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OpenStudy (kamille):
Well, let's say there are x files, so in 240 s it has checked 0,3x So a proportion: 0,3x-240s x-y s y=240x/0,3x) y=800
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