Question 145583
Karl's age: x
Jane's age: y

Karl's age in 6 years: (x + 6)
Jane's age in 6 years: (y + 6)


Now:
{{{x=7y}}}


6 years from now:
{{{x+6=3(y+6)}}}


Substitute the value indicated for x in the first equation into the second equation.


{{{7y+6=3(y+6)}}}


Solve for y to get Jane's age now, then calculate Karl's age using that information.