Question 1059743
Assume Anna is x years old.
So then, John is 6x years old.
In twelve years, John will be 6x+12 years old and Anna will be x+12 years old.
So in twelve years, John will be twice as old as Anna,
{{{6x+12=2(x+12)}}}
{{{6x+12=2x+24}}}
Subtract 2x+12 from both sides,
{{{6x+12-2x-12=2x+24-2x-12}}}
{{{4x=12}}}
Divide both sides by 4,
{{{(4x)/4=12/4}}}
{{{(4/4)x=3}}}
{{{(1)x=3}}}
{{{x=3}}}