Can you replace the question mark with the correct number?

What do you see in the image below

I have an eye but still cannot see.

Who am I?

What has to be broken before you can use it?

I have Rs.50 and I spend it in the way as below.

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Identify the 10 differences between the two given pictures.

What is the word or phrase?