Para calcularmos a massa final de um decaimento radioativo, temos:
m = mo/2^n (Massa final é igual a Massa inicial dividida por 2 elevado ao número de Meia-Vida)
m = 512/2^30
m = 512/1073741824
m = 0,00000047gramas
m = 47.10^-8 gramas
(A questão foi mal elaborada, o valor de massa final foge dos padrões das provas.)

x=2mo=512/2=256m=?m=mo/2²m=256/4m=64

A questão foi muito mal elaborada, o tempo que o aluno tem para executar a prova INTEIRA não é tanto, a questão tem que ser complexa até um ponto que ele consiga fazer em 3 minutos no máximo!! Estava observando os resultados e ninguém chegou a um exato.. 

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