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2014-11-17T13:52:15+02:00
A×(b+c)=6000⇒a×b+a×c=6000⇒a×b+4000=6000⇒a×b=6000-4000⇒a×b=2000.
a×b=2000;b=10⇒a=2000:10=200⇒303×a=303×200=60600

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2014-11-17T13:54:50+02:00
A(10+c)=6000        
ab+ac=6000
ab+4000=6000 
ab=2000 
a=2000/10
a=200
303x200=60600