It's 12 because if you divide 6 by 0.5 you should get 12, so basically use the opposite operation. 
Hope that helps!
 
        
             
        
        
        
Answer:
14 and 2/3rd cups of flour for 4 batches
Step-by-step explanation:
 
        
             
        
        
        
So normally it is
if 8x is to 6y, then how many x is to 42y?
it could be
if 8x:6y then how many x:42y or
if 8x:6y then how many y:42 x
I will solve for both
if it is
x:42y go to AAAAAAAA
if it is 
y:42x then go to BBBBBBBBBB
AAAAAAAA
 how many concerts are equal to 42 symponies
arrange in concerts to symponies format
8:6=x:42
fractionify
8/6=x/42
multiply boht sides by 42
336/6=x
56=x
56 concerts equals 42 symponies
BBBBBBBBBB
 how many  symponies are equal to 42 concerts
areange in symponies:concerts
6:8=x/42
fractionify
6/8=x/42
multiply boht sides by 42
252/8=x
31.5=x
31.5 symponies to 42 concerts
so it could be
56 concerts to 42 symponies
or
31.5 symonies to 42 concerts
        
             
        
        
        
Answer: x = 15, 95 degress, 85 degrees
Step-by-step explanation:
(2x + 65) + (3x+40) = 180 
5x +105 = 180 
5x = 75
x = 15 
2 (15) +65 = 95 deg
3 (15) +40 = 85 deg