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0,25=25/100=1/4
0,2=2/10=1/5
a/3=b/4=c/5=k
a=3k
b=4k
c=5k
(3k+4k+5k)/3=60 =>12k=180 =>k=180/12=15
a=3×15=45
b=4×15=60
c=5×15=75