Can you fill the blank with the correct number?

6 30 870 756030 _____

What is harder to catch the faster you run?

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

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

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What is common among 11, 69, and 88?

What is the probability of choosing the correct answer at random from the options below?

a) 1/4
b) 1/2
c) 1
d) 1/4

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

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?