tag:blogger.com,1999:blog-4912713243046142041.post5899081383772304111..comments2021-05-09T16:19:03.112-05:00Comments on TYWKIWDBI ("Tai-Wiki-Widbee"): Frustrating (but simple) math problemMinnesotastanhttp://www.blogger.com/profile/01382888179579245181noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-4912713243046142041.post-15312978433162076832013-03-13T10:20:06.347-05:002013-03-13T10:20:06.347-05:00I don't understand your comment about my makin...I don't understand your comment about my making an "assumption about how old Sophie was..."<br /><br />The problem states "...33 years old...is three times as old as Sophie was..."<br /><br />And is there an answer that doesn't involve round numbers?<br /><br />I understand your algebra is correct, but I don't see the error in my logic.Minnesotastanhttps://www.blogger.com/profile/01382888179579245181noreply@blogger.comtag:blogger.com,1999:blog-4912713243046142041.post-91930237089469620232013-03-13T09:09:18.882-05:002013-03-13T09:09:18.882-05:00You're making an assumption about how old Soph...You're making an assumption about how old Sophie was, and that the problem uses round numbers.<br />If you just say 33 = 3(s-x) where x is how ever many years ago this was, then we know that 33-x=s where s is the number of years old sophie is now. Then x=33-S and plug back into the first equation 33=3(s-(33-s))<br />33=3(2s-33)<br />33=6s - 99<br />132=6s<br />s=22<br />Your assumption happened to be correct in this case, but it isn't necessary to solve the problem.Michael Edwardshttps://www.blogger.com/profile/15045793257864918669noreply@blogger.comtag:blogger.com,1999:blog-4912713243046142041.post-74264418009353815262008-02-25T10:43:00.000-06:002008-02-25T10:43:00.000-06:00Obviously 33 is 3 times 11, which is how old "Soph...Obviously 33 is 3 times 11, which is how old "Sophie was." That's the obvious part. <BR/><BR/>Make two columns - "past" and "now."<BR/><BR/>Past - Sophie was 11, set Ellie as "x"<BR/><BR/>Now - Ellie is 33, and now (as the puzzles says), Sophie is "x."<BR/><BR/>How many years have passed between "past" and "now." You don't need to know - just know that it is the same for both girls.<BR/><BR/>So X-11 (the difference for Sophie) equals 33-X (the difference for Ellie). Rearrange, simplify, and all that, and X = 22.Minnesotastanhttps://www.blogger.com/profile/01382888179579245181noreply@blogger.com