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x, y, k

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Junior | Next Rank: 30 Posts
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x, y, k

by sal2 » Tue Dec 29, 2009 1:55 pm
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
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by rohan_vus » Tue Dec 29, 2009 2:08 pm
The eqn reduces to [10 + 10*y/(x+y)]

This implies k >10 but <20.. Now it all depends on what the term 10*y/(x+y)...
3 possibilities

a) If y = x then k = 15
b) if x > y then k <15 and from the answer choices 12 would be the answer then
c) if x < y then k > 15 and in which case from answer choices u have 18

So , is this question complete ? . Is there is no info if x > y or x<y or anything ?

With the question as it is there is no one answer till u know x<y or x>y or x= y
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Junior | Next Rank: 30 Posts
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by sal2 » Tue Dec 29, 2009 2:47 pm
Sorry, x<y, but you already got the right answer
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