Can you replace the question mark with the correct number in the below table sequence?

Our product and our sum always give the same answer. Who are we?

You need to arrange three 7 and mathematical symbols to form number 1?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

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 was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

Find the 8 in the below-given Image.

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?

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?