How many sides does a circle have?

Replace the question mark with the number below given a simple math problem.

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

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?

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?

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

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

What has to be broken before you can use it?

Find the number of squares in the below picture

What number do you get when you multiply all of the numbers on a telephone's number pad?