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22 Jul 2009, 07:10
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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how to solve this! What is the concept!
\(\frac{1}{x} + \frac{1}{y} = \frac{36}{323}\)
find the value of x-y
(1) x and y are prime.
(2) x>y>1
From the \(\frac{1}{x} + \frac{1}{y} = \frac{36}{323}\) we get that
x+y=36 and x*y = 323
this comes down to an equation where
-y*y+36y-323=0
where D<0 thus cannot be solved,
Does this mean that OA is E
Artuurs
\(\frac{1}{x} + \frac{1}{y} = \frac{36}{323}\)
find the value of x-y
(1) x and y are prime.
(2) x>y>1
From the \(\frac{1}{x} + \frac{1}{y} = \frac{36}{323}\) we get that
x+y=36 and x*y = 323
this comes down to an equation where
-y*y+36y-323=0
where D<0 thus cannot be solved,
Does this mean that OA is E
Artuurs
Archived Topic
Hi there,
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22 Jul 2009, 07:24
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iwillwin
Was it guessing or what!
what is the concept being tested
