X >7. I hope this helps, happy learning.
        
             
        
        
        
If something is 60% off, that means it is now going to be 40% of its original price because 
100 - 60 = 40
To find final price multiply the percentage as a decimal by the price.
40% is 40/100 which as a decimal is 0.4
0.4 x 100 = $40
The pants will be 40 dollars.
        
                    
             
        
        
        
X = 7
y = 10
x + y = 700
7x + 10y = 6400
 10x + 10y = 7000
(-) 7x + 10y = 6400
 ______________
 3x = 600
 x = 200
200 + y = 700
y = 500
        
             
        
        
        
To determine the length of the hypotenuse, apply Pythagorean theorem. 
A^2 + B^2 = C^2 
(10)^2 + (24)^2 = C^2 
100 + 576 = C^2 
676 = C^2 
C = 26 cm. 
The hypotenuse is 26 cm.
        
                    
             
        
        
        
So there are x girls and x-4 boys and together they make 28: 
x+x-4=28
2x-4=28
2x=32
x=16
so there are 16 girls and 12 boys. 
the ratio is then 16:12, or we can simplify (by dividing both sides by 4): 4:3
so the best answer is 4:3.