The half-life of ^65 Zn is 245 days. After x days, 75 % of original activity remained. The value of x in days is ____. (Nearest integer) (Given: log…

The half-life of $\displaystyle { }^{65} \mathrm{Zn}$ is $\displaystyle 245$ days. After $\displaystyle x$ days, $\displaystyle 75 \%$ of original activity remained. The value of $\displaystyle x$ in days is $\displaystyle \_\_\_\_$. (Nearest integer) (Given: $\displaystyle \log 3=0.4771$ and $\displaystyle \log 2=0.3010$ )