what's the probability of getting a king or a queen from a pack of 52 cards?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Find the number of squares in the below picture

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

Which Burger Is Different in below image?

Identify the hidden meaning behind this picture?