What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Which five letter word can be added at the end of below word to form a
valid word?

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What is black when you buy it, red when you use it, and gray when you throw it away?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

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?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?