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a= 7/20*16= 5,6
b= 5,6-3,8= 1,8
5,6+1.8=7,4
c= 16- 7,4= 8,6
a=7/20*16=28/5=5 3/5
b=a-3,8
b=5 3/5-3,8=5 3/5- 3 4/5= 1 4/5
c=16-a-b
c=16-5 3/5 -1 4/5=8 2/5