Question 107775
(a)Janet will be {{{13+x}}}, Jeong will be {{{31+x}}}
--------
(b){{{31 + x = 2(13+x)}}}
{{{31 + x = 26 + 2x}}}
{{{x = 5}}}In 5 years Janet will be 18, Jeong 36
--------
(c){{{31 + x = 3(13 + x)}}}
{{{31 + x = 39 + 3x}}}
{{{2x = -8}}}
{{{x = -4}}} 4 years ago, Janet was 9 and Jeong was 27
---------
(d){{{31 + x = 13 + x}}} This is never true for any x 
--------
(e){{{31 + x = 13 + x + 18}}}
{{{31 + x = 31 + x}}}
{{{x = 0}}} So, right now Jeong is 18 y older than Janet
--------
(f) {{{31 + x + 13 + x  = 85}}}
{{{2x = 85 - 44}}}
{{{2x = 41}}}
{{{x = 20.5}}}Janet will be 33.5, jeong 51.5
{{{31 + x + 13 + x = 36}}}
{{{2x = 36 - 44}}}
{{{x = -4}}} 4 y ago, Janet was 9 Jeong was 27