What does this below rebus puzzle mean?

Different lights make me strange by changing me into different sizes. What am I?

What is the next number?

77, 49, 36, 18 ?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

Can you replace the question mark with the correct number in the below table sequence?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

What is wrong in the below Picture?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?