Element $X$ decays into element $Y$ with a half-life of $3$ days. On March $1$st,the mass of $X$ is $10 \, g$. What will be the masses of $X$ and $Y$ after $6$ days?
- A$X = 2.5 \, g$ and $Y = 7.5 \, g$
- B$X = 5.0 \, g$ and $Y = 5.0 \, g$
- C$X = 7.5 \, g$ and $Y = 2.5 \, g$
- D$X = 10 \, g$ and $Y = 0 \, g$
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