Three friends visit a restaurant for dinner. Their total bill comes to Rs 300 and each man pays Rs 100 to the waiter. Then, the restaurant owner notices that he has included one dish extra and asks the waiter to return Rs 50 to the men. Since Rs 50 cannot be equally divided among the three men, the waiter pockets Rs 20 and returns Rs 10 to each man. At this point, each man has paid Rs 90 (which totals Rs 270) and the waiter has Rs 20. This totals Rs 290. Where did the remaining Rs 10 go?

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