Question 425515
-------------	cost	----------------quantity		
chocolate A	0.9	----------------10
chocolate B	1.2	----------------x
Total	1	----------------	10+x

0.9*10+1.2*x=1(10+x)								
9+1.2x=10+x					
1.2x-x=10-9					
0.2x=1									
/0.2									
x=5 pounds $1.2	chocolate A