Question

Mr. X aged 35 was born in January 1980 on a Monday. He has a son and daughter where the son is elder and the sum of the ages of his kids is 8. The son was born on X's birthday What can be the year of birth of the son?

• A. 2007
• B. 2008
• C. 2009
• D. 2010

Answer 1

Answer:

B. 2008

Mr. X aged 35 was born in January 1980 on a Monday So the current year is 1980 + 35 = 2015 He has a son and daughter where the son is elder and the sum of the ages of his kids is 8 The possible combination of their ages is [7, 1], [ 6, 2], [5, 3] Then son's birth year may be 2015 - 7 = 2008, 2015 - 6 = 2009, 2015 - 5 = 2010 Since son was born on X's birthday , the birth year of son is similar year of 1980 So find the similar year of 1980 Since 1980 is a leap year and the only leap year in the option is 2008 So the year of birth of the son = 2008