Can you count the number of quadrilaterals in the picture below?

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

What Word am I Looking For ?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

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

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Why is the Hole below a Lock?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

Bay of Bengal is in which state?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?