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30 votes per day +10 for questions only (Q only votes can't be used after 25 votes cast on answers)
In The Complete Rate-Limiting Guide, here's the explanation for the votes. But although I try my best, I still can't understand what does "Q only votes can't be used after 25 votes cast on answers" mean. Does it mean if a user casts 25 votes on answers, so he can only cast 30 votes today not another 15 votes on questions?
Exactly.
When a user starts using up their votes, the system eventually pops up a warning to the effect of "you only have X votes remaining", starting when they have five left. Once someone has voted on 25 answers, it needs to start popping that warning up, even though they might (without this rule) be able to vote another fifteen times. So, to keep things simple, once that message has popped up (i.e. you cast 25 votes on answers), Stack Exchange simply removes any remaining Q-only votes you could otherwise cast.
It wasn't always this way; see this question for some of the history behind the ten question-only votes.
Does it mean if a user casts 25 votes on answers, so he can only cast 30 votes today not another 15 votes on questions?
That's exactly what it means. If you cast 25 votes on answers and none on questions, you only have 30 votes that day. Every question vote done before reaching 25 votes bumps up the limit up to 40.
