Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Michael
Posts:
2
From:
sundsvall
Registered:
5/28/13


Name this formula
Posted:
May 28, 2013 11:30 AM


Today our teacher showed us a way to solve problems like this: /\ ./ \ ../ \ 8 .../ \ ..../ \ ...../_____\ ....../ 10 \ X ......../ \ ........../ \ ............/__________________\ 15
Find X. He posted a way that almost took him up to 20 minutes to explain but i was thinking about this
1510=5 10/5=2 That means 8 is 2 times bigger then X so x/2=4
But he said that I couldent use it unless i could prove it . So is there allready a formula like this one or any way to prove it works?



