The centre of the third figure is empty. What digit should fit inside?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title