What is the next shape from answers A, B, C, and D figure?

I am white when I am dirty, and black when I am clean. What am I?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Count the Triangle in the figure given below:

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

What is the centre of gravity?