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scott began printing his history paper at 3:15. at 3:20,he found that it had printed 12 of his 15 pages.


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4 Answers

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



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.

Any type of ratio problem like this, just cross multiply: You have (12/5) = (15/x).  You get 12(x) = 75

x = 6.25 min or 6 min and 15 seconds.

In five minutes, he printed 12 pages.  At this rate, in how many minutes did he print 15 pages?

Quick approach: 5:12 = t:15

Solve for t,

t = 25/4 = 6.25 minutes


Robert, i meant to upvote the answer you presented.  sorry