x- 12,5%x= 45 min
87,5%x=45min
0,875x=45min
x= 45 : 0,875
x~w przybliżeniu 51
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x- 12,5%x= 45 min
87,5%x=45min
0,875x=45min
x= 45 : 0,875
x~w przybliżeniu 51