Question 564662
--------	price	----------------	quantity								
Coffee type I	90	----------------40	pounds					
Coffee type II	30	----------------x	pounds					
Mixture	70	----------------40+x	pounds					
											
90*40+30x=70(40+x)
3600+30x=2800+70x			
30x-70x=2800-3600				
-40x=-800								
/-40										
x=20pounds of 	Coffee type II							
											
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