Question 1068523
1.{{{A+B=1000}}}
2.{{{4A+6.5B=5000}}}
Multiply eq. 1 by 4 and subtract from eq. 2,
{{{4A+6.5B-4A-5B=5000-4000}}}
{{{2.5B=1000}}}
Now solve for B. 
Then use either equation to solve for A.