Răspuns:
a,b,c numerele
(a+b+c):3=23,17
a+b+c=23,17•3
a+b+c=69,51
(a+b):2=28,541
a+b=28,541•2
a+b=57,082
=> 57,082+c=69,51
c= 69,51-57,082
c=12,428
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