What is harder to catch the faster you run?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

What four weights can be used to balance from 1 to 30 pounds?

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?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Can you find the missing piece of the Porsche?

When we see 2 but call 10?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?