book Maths Puzzle Numerical Ability

in jan. 2000 john was 11 times as old as his son. in jan 2012 he will be 3 times as old as his son. how old was his son in jan 2000?

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Hi, I'm trying to verify a graph that I did for a problem I'm working on. I am hoping that one of the tutors could please show me a solution to the below problem so I see if my gr 3A+2A-(4A+7)