What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

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?

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

Which Travels Faster? Solve below famous picture riddle:

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

2, 3, 5, 9, 17, _ What is the next number in the sequence?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Why Aeroplane windows are round?