SOLUTION: A retired couple sold their home. They invested part of the money in home mortgages at 15% interest annually. They invested $20,000 less than this amount into CD's at 9% annnual

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Question 105698: A retired couple sold their home. They invested part of the money in home mortgages at 15% interest annually. They invested $20,000 less than this amount into CD's at 9% annnual interest. How much money did they invest if they recieved $15,000 per year interest from the two investments.
Can you please give me the equation for solving this problem as well as the answers.
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
.15X+.09(X+20,000)=15,000
.15X+.09X+1,800=15,000
.24X=15,000-1,800
.24X=13,200
X=13,200/.24
X=55,000 INVESTED @ 15%.
55,000+20,000=75,000 INVESTED @ 9%.
PROOF
.15*55,000+.09*75,000=15,000
8,250+6,750=15,000
15,000=15,000