Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

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?

Find the next number in the series below

21 32 54 87 131 ?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

With the help clues provided in the image, can you find the 5 digit key?

What kind of storm is always in a rush?