Question 369458
Manuel is ten times older than his son, Andrew. In 20 years, Manuel's age will be 4 more than twice Andrew's age. How old was Manuel when Andrew was born??

Let A = age of Andrew now
  10A = age of Manuel now

10A -A = age of Manuel when Andrew was born

10A + 20 = 4 + 2(A+20)
      8A = 24
       A = 3

      9A = 27

Manuel was 27 years old when Andrew was born