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2 dzień--->4/15=8/30
3 dzień--->2/5=12/30
4 dzień---->13 stron
9/30+8/30+12/30=29/30
13 stron=30/30-29/30=1/30
13=1/30 /*30
1=390
odp.Ta książka ma 390 stron:P