Question 967828
     Let the present age be 'p'
        In twelve years time
    p + 12 = pē
    pē - p - 12 = 0
    pē + 3p - 4p - 12 = 0
    p(p + 3) -4(p + 3) = 0
    ( p + 3 ) ( p - 4 ) = 0
    p + 3 = 0   or   p - 4 = 0
    p = -3    or   p = 4
Since one's age cannot be negative 
Therefore her present age is p = 4