April 18th, 2014, 08:43 AM  #1 
Newbie Joined: Feb 2012 Posts: 8 Thanks: 0  Solve for y
It's probably obvious but not to me. 2^(y+1) = 3*5^y I thought ((Y+1)/y)ln2/ln5)=ln3 would have given me the answer but doesn't seem to check. Cheers. 
April 18th, 2014, 08:49 AM  #2 
Senior Member Joined: Sep 2013 From: Earth Posts: 827 Thanks: 36  
April 18th, 2014, 09:11 AM  #3 
Newbie Joined: Feb 2012 Posts: 8 Thanks: 0 
Thanks. Your solution gives the right answer on the check ie. .4425 but I can't see what steps you used to get your solution.

April 18th, 2014, 09:18 AM  #4 
Newbie Joined: Feb 2012 Posts: 8 Thanks: 0 
Ah. The penny has just dropped. 
April 18th, 2014, 01:12 PM  #5 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039  