Posted by Allen on Thursday, April 9, 2009 at 2:49am.
Business and finance. Avirus 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?

math  jen, Thursday, April 9, 2009 at 3:01am
if you add another 40%, you will be done with 80% in 600 seconds. 20% is left. .20 times 600=120 sec
600+120=720 sec

math  Reiny, Thursday, April 9, 2009 at 8:03am
Jen is wrong.
A simple test of taking 40% of her answer of 720, which would be 288, would have indicated it was not right
let the total time be x seconds
so .4x = 300
x = 300/.4 = 750 seconds
(check: 40% of 750 = 300)
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