Răspuns :
[tex]\text{Media aritmetica} = \frac{a+b+c}{3} \\ \\ 75= \frac{a+b+c}{3} \\ \\ a+b+c=75 \times 3 \\ a+b+c=225[/tex]
[tex]ma =75= \frac{(a+b+c)}{3} =\ \textgreater \
(a+b+c)=75*3
(a+b+c)=225[/tex]