Question 548125
Fund A	6.00%		per annum	---x					
Fund B	9.00%		per annum	---y					
									
x		+	y=	20000	------------------------1				
6.00%	x	+	9.00%	y=	=	$1,440.00			
Multiply by 		100							
6	x	+	9	y=	=	$144,000.00		--------2	
									
Multiply (1) by			-6						
we get									
									
-6	x	-6	y=	=		-120000.00			
									
Add this to (2)									
									
0	x	3	y=	=		$24,000.00			
									
divide by		3							
									
y	=$8,000.00		investment at 	9.00%
Balance	$12,000.00	investment at 	6.00%
CHECK									
$12,000.00	---------	6.00%	-------	$720.00					
$8,000.00	-------	9.00%	-------	$720.00					
Total			--------------	$1,440.00