If $$\(x\)$$ and $$\(y\)$$ are positive numbers and $$\(x+y=2\)$$, which of the following could be the value of $$\(20 x+50 y\)$$ ?
A.
35
B.
65
C.
105
D.
140
Exam No：2020 First Round Grades 8-9 Year：2020 Question No：9
Answer:
B
Knowledge points:
G8-9 - Algebra - Functional Notation & Custom Operators
Solution:
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