Can you fill the blank with the correct number?

6 30 870 756030 _____

How many triangles can you find in this given picture?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

Find out the missing number in the picture attached:

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?