Question 473331
Let x is Joe's age now
In 8 years Joe will be {{{(x+8)}}} years old
4 years ago Joe was {{{(x-4)}}}
In 8 years Joe will be twice the age he was 4 years ago, so {{{x+8=2(x-4)}}}
{{{x+8=2x-8}}}
{{{x-2x=-8-8}}}
{{{-x=-16}}}divide by -1
{{{x=16}}}
Answer 2=16