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2014-09-24T19:10:21+03:00
Regula de trei simple
180.....40%
x.........60%

180*60/40=270
60%=270
40%=180
in total bunicul avea 270+180=450
5 4 5
2014-09-24T19:10:30+03:00
40% din x =180
4/10 * x = 180
4x=1800
x=450
60% din 450 = 6*45 =270
4 5 4