$$140$$ students are involved in voting for the Model Student. Alice has received $$31$$ votes, Betty $$41$$ votes and Cindy $$47$$ votes so far. At least how many more votes must Cindy receive to ensure that she is the Model Student? 
Overseas Competition->Knowledge Point->Counting Modules->Permutations and Combinations->Combinations Overseas Competition->Knowledge Point->Combinatorics->Pigeonhole Principle->Worst Case in Pigeonhole Principle Problems