I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

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?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

Count the Triangle in the figure given below:

Where do you go to learn how to make ice cream?

What kind of tree can you carry in your hand?

I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
also make u smile and blush ☺️
What am I?

Find the number of squares in the below picture

What will you call your mother's brother's brother-in-law?

Can you identify the hidden rebus in the image below?