Question 1032856
Timmy has three times as much money invested at 5% bonds as he has in stocks paying 7%. 

investment at 7% -----------x
Investment at 5% -----------3x

annual income from the stocks and bonds is $158.40, 

3x*5% +7%x=158.40

multiply by 100
15x+7x=15840
21x=15840
x= 720

 $2160 invested in bonds