Barry said "the first challenge you have to subtract the month of birth from the day of birth. When you calculate the second challenge, you have to subtract the day of birth from the year of birth. When you calculate the third challenge you have to subtract the first challenge number total from the second challenge number total. When you calculate the fourth challenge you have to subtract the month of birth from the year of birth," why wasn`t the professer noticing his answers what was up with him