12•1
13•6
12/78 divide both numbers by 6 to simplify 
 Answer- 2/13
        
                    
             
        
        
        
Answer:
3/4
Step-by-step explanation:
15/20=3/4 if you divide both sides by 5
 
        
                    
             
        
        
        
Answer:
Option B.
Step-by-step explanation:
The given triangle is a right angle triangle.
In a right angle triangle,
 
In the given triangle,
 
 
 
Using Pythagoras theorem, we get
 
 
 
 
Taking square root on both sides, we get
 
 
Therefore, the correct option is B.
 
        
             
        
        
        
Answer :  7.5 ft
Step-by-step explanation:
when the length of the shadow is 8ft, the actual height of the man = 5ft
8:5
let the giraffe be 'x' ft tall.
if the length of the shadow is 12ft, actual height = x ft
12:x
 8:5 x 12:x
  ×
 × 
x=  
 
x=7.5 ft
Therefore, the giraffe is 7.5ft tall.