A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

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How can you take 2 from 5 and leave 4?

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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?