Răspunsuri

2014-05-28T18:45:02+03:00
X-suma initiala
30x/100=3x/10 a chetuit
x-3x/10=(10x-3x)/10=7x/10  rest
7x/10·2/7=2x/10 a cheltuit
7x/10-2x/10=5x/10 rest
5x/10=1800
x=1800·10/5
x=3600

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