If 21x = 79x, what is the value of x?

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

Solve below rebus puzzle?

How many times can you subtract the number 5 from 25?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What can you catch but never throw?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

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?

Can you spot the man between the coffee bean in the picture below ?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?