Question 476494
$9 ticket	x	numbers						
$4 ticket	y	numbers						
								
1	x	+	1	y	=	1020	.............1	
9	x	+	4	y	=	7680	.............2	
								
multiply (1)by 		-4						
Multiply (2) by		1						
-4	x		-4	y	=	-4080		
9	x	+	4	y	=	7680		
Add the two equations								
5	x				=	3600		
/	5							
x	=	720    			
plug value of 			x	in (1)				
1	x	+	1	y	=	1020		
720		+	1	y	=	1020		
			1	y	=	1020		-720
			1	y	=	300		
				y	=	300
$ 9 tickets 720 numbers
$4 tickets  300 numbers

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