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15 - x
x= 25%
b) 60-100%
45 - x
x=75%
0,25 = 25%
b). trzy-czwarte = 0,75
0,75=75%
kwadrans= 15 min
60 min - 100%
15 min- x
60*x=100*15
x = 25%
2.
60 min - 100%
45 min - x
60 * x= 100 * 45
x = 75%