Use the following information:
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?