题目

By the end of July, a certain baseball team had played 80% of the total games to be played that season and had won 50% of those games. Of the remaining games for the season, the team won 60%.


Quantity A

Percent of total games won for the season

Quantity B

52%

选项

A.

The quantity in Column A is greater.  


B.

The quantity in Column B is greater.


C.

The two quantities are equal.


D.

The relationship cannot be determined from the information given.

解析

对于百分数问题,选取一个简便的总比赛场数作为“假设数”,100 是个不错的选择。 假设赛季总比赛场数为 100 场。该队在七月前赢得了其中 80% 的比赛,那么已进行的比赛场数为 100×0.8=80 场。该队在这些比赛中的胜率为 50%,即赢得了 80×0.5=40 场。 接下来,该队赢得了剩余比赛的 60%。总比赛场数为 100 场,已进行 80 场,因此还剩 100 - 80 = 20 场。该队在剩余比赛中胜率为 60%,即赢得了 20×0.6=12 场。 综上,该队总共在 100 场比赛中赢得了 40 + 12 = 52场,即占总比赛场数的 52%。两个量相等。
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