What has 13 hearts but no other organs?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

I cannot talk, but I always reply when spoken to. What am I?

How many letters are in the alphabet?

Can you find out the remainder when 3^300 is divided by 5?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Solve below popular number sequence
314 159 265 358 979 323 846 ?