A algebraWhat New member Joined Aug 25, 2015 Messages 1 Aug 25, 2015 #1 Mikes age is 3 times John's age. In 12 years, Mike will be twice as old as John. How old are Mike and John? Trying to write the correct equation... So, M=3J Then M+12 = 2J but doesn't there have to be a +12 on the J side? I'm missing a step.