Răspuns :
( a +b +c ) : 3 = 600 = > a+b+c = 600 x 3 = 1800
( a + b) : 2 = 220 = > a +b = 220 x 2 = 440
440 + c = 1800
c = 1800 - 440
c = 1360
a = 1/5 din b = b/5
b/5 + b = 440 / x 5
b + 5b = 2200
6b = 2200
b = 2200 /6
a = 440/6
( 440/6 + 2200/6) : 2 = 2640/6 : 2 = 440 : 2 = 220
( a + b) : 2 = 220 = > a +b = 220 x 2 = 440
440 + c = 1800
c = 1800 - 440
c = 1360
a = 1/5 din b = b/5
b/5 + b = 440 / x 5
b + 5b = 2200
6b = 2200
b = 2200 /6
a = 440/6
( 440/6 + 2200/6) : 2 = 2640/6 : 2 = 440 : 2 = 220