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?

How many triangles can you find in this given picture?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

What is black when you buy it, red when you use it, and gray when you throw it away?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

What is the Surname of Barbie Doll?

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?