exam Maths Puzzle Numerical Ability

this year your brother james
will be 2 years from being twice as old as your sister jenny. The sum of james age and 3 times jennys age is 66. How old is Jenny

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Suppose y=mx+b is a mathematical model for actual time as a function of estimated time, where y represents actual time and x represents estimated time and m and b x^7y^2-4x^5y^2-21x^3y^2