Aisha S. | Best Tutor For Math and WritingBest Tutor For Math and Writing
This can be treated as a ratio problem. From 3:15 to 3:20 is 5 minutes. Scott printed 12 pages in 5 minutes. That is 12 to 5. You want to know how long it will take Scott to print 15 pages at this rate. Equal the 12 to 5 ratio to 15 to “unknown time” or “t” .
Multiply both sides by 5 and t.
t=6.25 or 6 minutes and 25 seconds
David W. | All Around Patient TutorAll Around Patient Tutor
If you need to know how much longer it will take to finish printing than. you look at it like this; it took 5min to complete 12 pages and he has 3 pages left to print. Therefore 5/12=x/3, then cross multiple to get 12x=15, then get x by itself so divide both sides by 12, x=15/12, so x=1.25min or 1min 15 sec.