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There are two candidates $\mathrm{P}$ and $\mathrm{Q}$ in an election. During the campaign, $40 \%$ of the voters promised to vote for $\mathrm{P}$, and rest for Q. However, on the day of election $15 \%$ of the voters went back on their promise to vote for $\mathrm{P}$ and instead voted for Q. $25 \%$ of the voters went back on their promise to vote for $\mathrm{Q}$ and instead voted for $\mathrm{P}$. Suppose, $\mathrm{P}$ lost by $2$ votes, then what was the total number of voters?

1. $100$
2. $110$
3. $90$
4. $95$