Update: (12 Sep 2012)
3 different solutions posted in comments by sriram, chetan, dvdreddy, insomniac and sarat
Update: (4 Feb 2013)
Solution by Sriram and Chetan needs explanation. So, we have 2 different solutions by dvdreddy, insomniac and sarat.
Source: Sent to me by Gaurav Sinha Problem: Siddhant writes a Maths test and correctly answers 5 out of 6 Arithmetic questions and 20...