The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 16, and k < m < r < s < t. If t is 40, what is the greatest possible value of the median of the 5 integers?
16
18
19
20
22
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k < m < r < s < t,不能有相等的数!
k < m < r < s < t,不能有相等的数!
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