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?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

If your uncle’s sister is not your aunt, what relation is she to you?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

Can you place six X (crosses) in below board without making three in a row in any way ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?