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80 % din X = 1040 ... Funda !! Si 20 de puncte !!!

Răspuns :

80x/100=1040, x=100x1040/80=1300
[tex] \frac{80}{100} x=1040 \\ \\ 80x=1040*100 \\ x=104000:80 \\ x=1300[/tex]