SOLUTION: Peter’s age in five years will be thrice his age 7 years ago. How old is Peter now?

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Question 833735: Peter’s age in five years will be thrice his age 7 years ago. How old is Peter now?
Answer by hamsanash1981@gmail.com(151) About Me  (Show Source):
You can put this solution on YOUR website!
let peter's present age be x.
his age in 5 years will be x+5.
his age 7 years ago will be x-7.
then x+5 = 3*(x-7)=> x+5=3x-21 => 2x = 26 => x=13