How do I figure out how to solve this Math problem?

Question

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?

Answer 1

40%<------>300 sec
100%<---->(100/40) x 300sec
= (5 / 2) x 300 sec
= 5 x 150 sec
= 750 sec
= 12 min 30 sec

Answer 2

It has checked 40% in 300 Seconds
It needs to check another 60%

The ammount of time it will take to finish is (60/40) X 300 Seconds = 450 Seconds.

*Pssst... 750 Seconds is the entire process

Answer 3

x total no of files
t total no of seconds
.40 x / 300 = x / t rate of scanner
x will cancel out in the equation
t = 300/.40 = 750 secs

Answer 4

40 % in 300s
So, 1% in 300s/40 = (30/4)s
=> 100% in (30 x 100)/4 = 30 x 25 = 750s
So, it will check all files in 12mins and 30 secs

Answer 5

750 seconds

Set up a proportion. When will it check 100% of the files

40 / 300 = 100 / n

300*100 = 40 * n
30000 = 40n
30000 / 40 = n
750 = n

Answer 6

40% of the files scanned in 300 sec.
1% of the files would have taken = 300/40=7.5 sec.
100% of the files would take =7.5*100=750 sec.
=12 mins. 30 sec.

Answer 7

300*(100/40) = 750 s

Answer 8

Let x = no. of seconds to check all files.

Equation:
0.4x = 300 seconds
x = 750 seconds

Answer: 12 1/2 minutes or 12 minutes & 30 seconds.

Answer 9

you divide 300 by 40. which equals 7.5. This means that for ever percent to be checked, it takes 7.5 seconds.

Then to find how many seconds it takes to check all the files you multiply 7.5 by 100 (percent) which equals 750. So it takes 750 seconds to check them all.

Answer 10

300 /.4 = 750 secs.