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2*(60% *a) = 30% * 20% * (2/5)a
2((60/100) * a) = (2/5)a * 20/100 * 30/100
2(3/5)a = (2/5)a * 1/5 * 3/10
(6/5)a - (2/5)a = 3/50
(4/5)a = 3/50
a=6/5 el número que se buscaba