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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