Can you fill the blank with the correct number?

6 30 870 756030 _____

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

Replace the question mark with the correct number.

The answer I give is yes, but what I mean is no. What was the question?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

What is next number in the pattern below:

131 517 192 123 ?