Plz me solve these prime number riddles 1. i am a prime number less than 100. if you add 10 or 20 to me the result is prime what number am i 2.i am a prime number less than 100. my digits add to 13. what number am i 3.i am a prime number less than 100.my tens digit is one more than my ones digits what number am i 4 .i am prime number between 20 and 70. if you reverse my digits the results is a larger prime number. what number am i