[問題]天山 03-15

[Janet]

Q15:
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?
A. 16
B. 18
C. 19
D. 20
E. 22
Answer:B

請問這題如何算呢?

我把k+m+r+s =X

(X+40)/5=16 --->X=40

然後就沒有思緒了!

[fiona]

KMRST中位數要最大就是R要最大
K=1
M=2
S=R+1

所以1+2+R+R+1=40
R=18

[Janet]

謝謝...^^ 非常的清楚....