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3/4 x=600
37,5 % z x = 300
x = 300*100 = 30 000
30 000 / 37,5 = 800 ------ szukany numer
3/4 = 75%
75% z 800
75% = 0,75
0,75*800=600
odp. trzy czwarte z tego numeru to 600 .