Well. My computer has fritzed up and
I'm having to perform some lenghy task, it's processing 20 files every 2 seconds, it's at 459000 of 854528
Roughly how long in seconds might it take?
I've currently tried;
854528 - 45900 / 20 = 831578
Is this,correct?
Hint: Note that it is processing $10$ files every second. (Do you see why?) How many files does it have left to process? How many seconds will it take to process that many files?
Addendum: One reason your answer was nowhere close to correct is that you forgot to include the parentheses in $$(854528-45900)/20.$$ Order-of-operations is a harsh mistress. See if you can figure out the other reason.