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Problem Num : 1 Type: None Section:Equation  Theme: Adjustment# : Difficulty: 2
Category	Diophantine Equation
Analysis
Solution/Answer	Answer: e

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Problem Num : 2 Type: Many Variables Section:Equation  Theme:Integer Property Adjustment# : 0 Difficulty: 2
Category	Diophantine Equation
Analysis	the range of x is limited.
Solution/Answer	Answer: E

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Problem Num : 3 Type: Modification Section:Equation  Theme:Many Variables Adjustment# : 0 Difficulty: 2
Category	Diophantine Equation
Analysis	Eliminate a variable.
Solution/Answer	a/c = 2/3 let say a=2k and c=3k (k is integer) then bk = 7, b= 7/k but 7/k >1 so.. k<7.. so k=1 b=7, a=2, c=3 Answer: b

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Array ( [0] => 4005 [1] => 3160 [2] => 4028 ) 3