IDNStudy.com, kung saan ang iyong mga tanong ay may malinaw at konkritong sagot. Sumali sa aming platform ng tanong at sagot upang makatanggap ng mabilis at eksaktong tugon mula sa mga propesyonal sa iba't ibang larangan.

A 42 year old man has a son 12 years old. In how many years will the father be twice as old as his son. 

Sagot :

let x = number of years when the father is twice as old as his son
thus
         42 + x = 2(12+x)
          x =  42-24 =18
   in 18 years time