People make me, save me, change me, raise me. What am I?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

A girl rode into a tourist spot out of the city on Thursday. She loved the place and decided to stay for a few days. She stayed for four days and then she left for back home on Thursday.

How can this be possible?

O_er_t_o_

Complete the missing letters of the given word.

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

What can go through glass without breaking it?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

If you say my name, I will no longer exist. What am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?