SBI PO Prelims Written Test Qs.(Quantitative Aptitude) :: Problems on Numbers - Discussion

I had about Rs.14.40 in one rupee coins and 20 paise coins when I went out for shopping. When I returned, I found that number of 20 paise coins and 1 rupee coins are exactly as 1 rupee and 20 paise coins respectively, that I had originally. I came back with one third of what I had started out with. How many one rupee coins did I have initially?