[gbrainy/stable] Better explanation for the Brothers and sisters puzzle

[Jordi Mas <jmas src gnome org>]

commit df82c9f31d29666791736b0ed20e71acbe520914
Author: Jordi Mas <jmas softcatala org>
Date:   Wed Apr 6 19:08:30 2011 +0200

    Better explanation for the Brothers and sisters puzzle

 data/games.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/games.xml b/data/games.xml
index a08cd97..6a8a3c4 100644
--- a/data/games.xml
+++ b/data/games.xml
@@ -42,7 +42,7 @@
 			</variables>
 			<_question>Out of [people] people, [brothers] have brothers, [sisters] have sisters and [both] have both. How many people have neither brothers nor sisters?</_question>
 			<answer>[rslt]</answer>
-			<_rationale>[brothers_only] people have brothers only, [sisters_only] sisters only and [both] have sisters and brothers.</_rationale>
+			<_rationale>It is calculated by taking the total number of people minus [brothers_only] people that have brothers only, minus [sisters_only] that have sisters only and minus [both] that have sisters and brothers.</_rationale>
 		</variant>
 	</game>