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?

What is the riddle which can be asked all day with a different correct answer each time.

If Rajina's daughter is my daughter's mom, who am I to Rajina?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

The answer I give is yes, but what I mean is no. What was the question?

What work can one never finish?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.