To guarantee that at least 20 vote on their favorite, we have consider the case where each ninja turtle get 19 votes.
When each character get 19 vote, the total number of votes = 19x4
= 76
The next vote (77th vote), whomever it gets, will get 20 votes.
So, number of people needed to vote to guarantee that at least 20 people all agree on the winner = 76 +1
= 77
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