What is the next number in this series?

4,12,84,3612....

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Which city is three-fifths chick two third cat and 50% goat?

Can you count the number of triangles in the picture below?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Can you find the six hidden animals in the picture below?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

Can you spot the hidden girl in the picture below?

Forwards I am heavy, backward I am not. What am I?