I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

What word begins and ends with an E, but has only one letter?

When is the top of a mountain similar to a savings account?

Can you solve the below algebraic mathematical equation?

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

Imagine you are in a room with no windows or doors. How will you get out?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?