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Eighty five people went to a lottery shop where they could bet on the DhanLaksmi, Rajshri, and Gauri lotteries. It was known that $20$ of them took all three ets, and $55$ of them took at least two of the three bets. Each bet cost Rs. $1$, and the total receipt of the lottery shop was $Rs. 145$. 

How many people took exactly one bet? 

  1. $5$ 
  2. $10$ 
  3. $15$ 
  4. $20$ 
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