Răspuns :

a/3 = b/12 = c/48 = k

a = 3k

b = 12k

c = 48k

a + b + c = 1890

3k + 12k + 48k = 1890

63k = 1890

k = 1890 : 63

k = 30

a = 3k = 3×30 =90

b = 12k = 12×30 = 360

c = 48k = 48×30 = 1440

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