[計量] gwd ps
請教一題GWD數學
If x, y, and k are positive numbers such that [x/(x+y)](10) + [y/(x+y)](20) = k
and if x < y, which of the following could be the value of k?
A. 10
B. 12
C. 15
D. 18
E. 30
答案為D
謝謝
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