Răspuns:
Explicație pas cu pas:
0,2 = 2/10 = 1/5
0,(3) = 3/9 = 1/3
0,125 = 125/1000 = 1/8
a*1/5 = b*1/3 = c*1/8 = k
a*1/5 = k ⇒ a = 5k
b*1/3 = k ⇒ b = 3k
c*1/8 = k ⇒ c = 8k
a)
(a/c)*100 = (5k/8k)*100 = 500/8 = 62,5%
b)
(b/c)*100 = (3k/8k)*100 = 300/8 = 37,5%
c)
2a - 3b = 20
2*5k - 3*3k = 20
10k - 9k = 20
k = 20
a = 5*20 = 100
b = 3*20 = 60
c = 8*20 = 160