Which Number is the odd one out?

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

What is full of holes but still holds water?

I have eight fingers and two thumbs but I do not live. What Am I?

I have branches, but no fruit, trunk or leaves. What am I?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

I travel all around the world but always stay in the corner. What am I?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Count the squares in the matchstick puzzle below?

What is the word or phrase?

Remove two matchsticks to make the below equation correct.