I knew there had to be an equation. lrb
"My email sends out an automatic message. Arachne members, please ignore it. I read your emails." -----Original Message----- >From: Joy Beeson <[email protected]> >Sent: Oct 1, 2015 4:29 PM >To: [email protected] >Subject: Re: [lace-chat] maths question from a non mathematician > >I missed the original post: > >>> Subject: [lace-chat] maths question from a non >>> mathematician >>> >>> This has nothing to do with lace but I've seen this >>> question answered before - when I didn't need the info. >>> I have a magazine with patterns printed at 50% and 75% >>> of full size. What size do I need to set a photocopier >>> to get 100% of pattern size? > >It's ninth-grade algebra: (If the word "algebra" gives you >brain-freeze, just read the part between dashed lines.) > > >Let P be the percent by which the pattern in the publication >has been enlarged or reduced. > >Let C be the percent at which you need to set your copier. > >Then P times C equals 100%: PC = 1 > >Divide both sides of the equation by P: C = 1/P >--------------------------------------------------------- >That is, you need to set the copier for the inverse of the >change that you want to undo. >--------------------------------------------------------- >You can punch "1 divide P equals" on your calculator, but if >the percentage happens to be a common fraction, you can just >turn it upside down. > >50% is 1/2, so to undo it, you use 2, which is 200%. >(Remember that "per cent" means "divide by one hundred".) > >75% is 3/4, so you would use 4/3, which is one and a third: > 133.33% > >-- >Joy Beeson >http://wlweather.net/PAGEJOY/ >west of Fort Wayne, Indiana, U.S.A. > >To unsubscribe send email to [email protected] containing the line: >unsubscribe lace-chat [email protected]. For help, write to >[email protected]. Photo site: >http://www.flickr.com/photos/lacemaker/sets/ To unsubscribe send email to [email protected] containing the line: unsubscribe lace-chat [email protected]. For help, write to [email protected]. Photo site: http://www.flickr.com/photos/lacemaker/sets/
