Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

When can we add 2 to 11 and get 1 as the correct answer?

Which is the smallest number that you can write using all the vowels exactly once?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What has 88 keys?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

What does this rebus mean?

O
N
C
E
TIME