Question 551357
Adult ticket 			x	numbers					
child ticket 			y	numbers					
									
1	x	+	1	y	=	125	.............1		
4	x	+	2.5	y	=	413	.............2		
Eliminate y									
multiply (1)by 		-2.5							
Multiply (2) by		1							
-2.5	x		-2.5	y	=	-312.5			
4	x		2.5	y	=	413			
Add the two equations									
1.5	x				=	100.5			
/	1.5								
x	=	67    				
plug value of 			x	in (1)					
1	x	+	1	y	=	125			
67		+	1	y	=	125			
			1	y	=	125		-67	
			1	y	=	58			
				y	=	58    
Adult ticket 			67    	numbers					
child ticket 			58    	numbers					
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