What does this below rebus puzzle mean?

What does this mathematical rebus means ?

Replace the question mark with the correct number below.

Can you find out who is the kidnapper in below Picture and why, Explain ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Five lovely ladies(Sophia, Isabella, Madison, Emma and Olivia) planned a picnic.

They each buy one thing each for the picnic.

Sophia, Emma and Olivia got a drink : orange-Juice, apple-juice, and mango-juice.
Olivia got the drink with the same letter as the one in her first name.
Emma loves mango-juice.
The other two bring some food : chocolates and pizza.
Also Madison is allergic to cheese.

So which ladies bought what ?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

Identify the 10 differences between the two given pictures.

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

Using eight eights and addition only, can you make 1000?