Question 7
Let $I,M,S$ and $O$ be digits that are not necessarily different that satisfies
$$\overline{IMSO}=\frac74\times\overline{OSMI}.$$
How many possible four-digit numbers $\overline{IMSO}$ are there?
$$\overline{IMSO}=\frac74\times\overline{OSMI}.$$
How many possible four-digit numbers $\overline{IMSO}$ are there?