Thread: 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?

300 is 40% of what?.

300=0.4x

Originally Posted by Patience

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?

So after cross-multiplying:


-Dan