Which alphabet is a part of our body?

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?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Count the number of triangles in the given picture.

I shave every day, but my beard stays the same. What am I?

Identify the 10 differences between the two given pictures.

You need to arrange three 7 and mathematical symbols to form number 1?

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?