SOLUTION: Timmy has three times as much money invested at 5% bonds as he has in stocks paying 7%. If his annual income from the stocks and bonds is $158.40, how much has he invested in bonds

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Question 1031393: Timmy has three times as much money invested at 5% bonds as he has in stocks paying 7%. If his annual income from the stocks and bonds is $158.40, how much has he invested in bonds?
USE SYSTEMS OF EQUATIONS TO SOLVE !!!
Found 2 solutions by josmiceli, MathTherapy:
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
Let = amount invested in stocks at 7%
= amount invested in bonds at 5%
-------------------------




and

$720 was invested in stocks
$2,160 was invested in bonds
--------------------------
check:




OK
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Timmy has three times as much money invested at 5% bonds as he has in stocks paying 7%. If his annual income from the stocks and bonds is $158.40, how much has he invested in bonds?
Let amount invested in bonds and stocks, be B, and S, respectively

Then: B = 3S______ -------eq (i)

Also, .05B + .07S = 158.4 ---- eq (ii)

 ------- Substituting  for S in eq (ii)



.15B + .07B = 475.2 ----------- Multiplying by LCD, 3 

.22B = 475.2

B, or amount invested in bonds = , or  

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