Puzzle 1

Posted on 11.10.2011

2


For example, I took $ 100 from a friend «A». I went to the store and lost them. I met another friend «B», and  took from him 50 dollars. I bought two chocolate bars for $ 10 each. So, I have 30 rubles, I give them to my friend «A», and still owes a friend «A» $ 70, and a friend «B» — 50, total 120; plus I have two bars of chocolate, — a total of 140. So where is $ 10? (transl. from rus.; site Vkontakte)

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