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=1/2+729/70=70/140+1458/140=1528/70=764/35
b=2 1/2:10+10 : 2 1/2=5/2*1/10+10/1*5/2=1/4+4=4 1/4=17/4
teraz proporcja (mnożenie na krzyż)
764/35-100%
17/4-x%
x=17/4 *100 :764/35
x=1700/4*35/764=425/4*35/191
x=14875/764
x=19 359/764
x=19 595/1000
x=19,595%