Answer: Yukiko's team will win 48 games if they play 64 games in all.
Explanation:
Yukiko plays on the softball team at her school. The team won 9 of its first 12 games. If this rate is constant, it means that if Yukiko's team play x games, the number of games that they would win is
9/12 × x = 9x/12
Therefore, if Yukiko's team play 64 games, the number of games that they would win in all is
(9 × 64)/12 = 576/12 = 48