I have branches, but no fruit, trunk or leaves. What am I?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

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

What Word am I Looking For ?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

I know a nine-letter word having only one vowel.
Do you ?

How many Watermelons are there in the below picture?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?