Can you count the number of quadrilaterals in the picture below?

Which of the eight images will fill the missing image in the puzzle below?

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?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Which alphabet letter is a question?

Which digit occurred maximum times between the number 1 and 1000?

You can hear me, but you can't touch or see me.

What am I?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?