题目信息
The average (arithmetic mean) length per film for a group
of 21 films is t minutes. If a film that runs for 66 minutes
is removed from the group and replaced by one that runs
for 52 minutes, what is the average length per film, in
minutes, for the new group of films, in terms of t?
A:$$t+\frac{2}{3}$$
B:$$t-\frac{2}{3}$$
C:$$21t+14$$
D:$$t+\frac{3}{2}$$
E:$$t-\frac{3}{2}$$
参考答案及共享解析
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正确答案：
B:$$t-\frac{2}{3}$$
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