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2014-11-04T10:39:33+02:00
100%-10%-30%=60%
60/100=6/10-din drum=42 km
X*6/10=42
x=42*10/6=70
70*10%=7
70*30%=21
70*60%=42

r: lungimea totala a drumului este de 70km

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