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Algebra, Geometry, International Mathematical Olympiads, Recreational Mathematics, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
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Algebra, Geometry, International Mathematical Olympiads, Recreational Mathematics, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
X+Z=8*25/5=40 , 3Z=9X=> Z=30
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