SOLUTION: Stan is 2/3 as old as Joe. In seven years, Stan will be 3/4 as old as Joe. How old are they now?

Algebra ->  Test -> SOLUTION: Stan is 2/3 as old as Joe. In seven years, Stan will be 3/4 as old as Joe. How old are they now?      Log On


   

Question 368914: Stan is 2/3 as old as Joe. In seven years, Stan will be 3/4 as old as Joe. How old are they now?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
let j = joe's age now. then 2j/3 = stan's age now.
3%28j+%2B+7%29%2F4++=+2j%2F3+%2B+7,
3j%2F4+%2B+21%2F4+=+2j%2F3+%2B+7,
3j%2F4+-+2j%2F3+=+7-21%2F4,
j%2F12+=+7%2F4, or
j = 21, joe's age now.
2j/3 = 14, stan's age now.