Question 13
In the base ten number system, the number $379_{10}$ means $3\times10^2+7\times10+9$.
In the base $r$ number system, where $r$ is a positive integer, if the equation $1020_r-460_r=230_r$ holds, then what is the value of $r$?
In the base $r$ number system, where $r$ is a positive integer, if the equation $1020_r-460_r=230_r$ holds, then what is the value of $r$?