The way it went in my head:
Huh, that's obvious, it's 1. Oh wait, 'more than.' So it's half the remaining .10.
(Although I would say it took less time than reading that sentence takes.)
It'd be interesting if getting the wrong answer first is the quickest method of getting the right answer.
I found a set of five experiments similar to the one I described. Getting the wrong answer first appears to be a good method to get to the right answer.
...Specifically, we evaluated the benefits of testing novel science instructional content before learning. Thus, the likelihood of failed tests was high, but we were able to extend our theory of testing to better understand whether trying and failing on test questions actually improved learners’ longer term retention of subsequently presented information...in the current study, the prequestions required part
http://psychcentral.com/news/2011/09/21/cognitive-style-tends-to-predict-religious-conviction/29646.html
I think this is the source but I can't be sure:
http://www.apa.org/pubs/journals/releases/xge-ofp-shenhav.pdf
http://lesswrong.com/lw/7o4/atheism_autism_spectrum/4vbc
Reddit /r/psychology discussion