120:5*12=24*12=288
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0,85=85/100=17/20
17:17*20=1*20=20
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2,5:5*9=0,5*9=4,5
------------------------------
40%=40/100=2/5
72:2*5=36*5=180
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4 1/11=45/11
2 19/22=63/22
63/22:45=63/22*1/45=7/22*1/5=7/110
7/110*11=7/10*1=7/10=0,7