Question 437217
Crop A - x
Crop B -y
Crop C-z

x+y+z=200.....................1
40x+60y+80z= 12600.............2
20x+25y+40z=5950...............3
consider equation 1 &2	Eliminate y												
Multiply 1 by	-60									
Multiply 2 by	1									
we get																
-60x-60y-60z=-12000						
40x+60y+80z=12600						
Add the two 																
-20x+20z=600	-------------4	
consider equation 2 & 3	Eliminate z		
Multiply 2 by -5
multiply 3 by 12												
we get 																
-200x-300y-400	z=-63000							
240x+300y+480z=	71400							
Add the two 																
40x+80z=8400	-------------5				5		
Consider (4) & (5)			Eliminate z													
Multiply 4 by	2												
Multiply (5) by	1												
we get															
-40x+40z=1200										
40x+80z=8400										
Add the two 																
120z=9600										
/120															
z=80									
Plug the value of z in	5						
40x+6400=8400								
40x=2000
								
x=50														
plug value of x & z in					1											
50+y+80=200									
y=-50-80+200									
y=70