Today was Catherine´s birthday. She turned 24. Catherine is twice as old as Ryan was when Catherine was as old as Ryan now. How old is Ryan now?..................
Simple Trick to quickly Square of numbers from 51 to 59
Simple Math trick to quickly get Square of numbers from 51 to 59:
5*5 + Unit Digit | Unit Digit * Unit Digit
If square of unit digit is single digit then put 0 in front of it to get the final answer.
