a=80
b=60%*80=48
c=(a-b)*50% = 32*50% = 16
a+b+c / 3 = 144/3 = 48
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b= 60% z 80= 48
c= (80- 48) * 50%= 16
80+48+16/3=48
II liczba - 60% × 80 = 48
III liczba - 50% ( 80 - 48) = 0,5 × 32 = 16
(80 + 48 + 16 ):3 = 144 : 3 = 48
odp.: średnia arytmetyczna tych liczb wynosi 48
a=80
b=60%*80=48
c=(a-b)*50% = 32*50% = 16
a+b+c / 3 = 144/3 = 48