Question 539769
Present age													
Ann	x												
Mark'	x	+	23										
													
After	9		years										
													
Ann	x	+	9										
Mark'		(	x	+	23	+	9	)					
		(	x	+	32	)							
													
		(	x	+	32	)	=	2	(	x	+	9	)
		1	x	+	32		=	2	x	+	18		
			x	-2	x	=	18	+	-32				
			-1	x	=	-14							
													
				x=	14								
Ann	age			=	14	years							
Mark'	age			=	37	years