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

What Word am I Looking For ?

You see me once in June, twice in November, and not at all in May. What am I?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

How many triangles are there in the picture below?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

What does the below mathematical rebus mean?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?