Let's see if papgust can get this one.
If x,y, and k are positive numbers such that 10x/(x+y) + 20y/(x+y) = k, which of the following could be a value of k?
10
12
15
18
30
If x,y, and k are positive numbers such that 10x/(x+y) + 20y/(x+y) = k, which of the following could be a value of k?
10
12
15
18
30
