20% off means it is selling for 80% of the original price ( 100% - 20% =80%)
Divide the sale price by 80% as a decimal:
380/0.80 = 475
The original price was $475
Justify:
Multiply the original price by 20% and subtract:
475 x 0.20 = 95
475-95 = $380 which is the sale price.
 
        
                    
             
        
        
        
Answer:
111.65
Step-by-step explanation:
$15.25 x 3 = $45.75
$32.95 x 2 = $65.9
Total: $111.65
 
        
                    
             
        
        
        
Step-by-step explanation:
x+6=3x+21
2x=-15
x=-7.50
 
        
                    
             
        
        
        
QUESTION 1
We want to solve,

We factor the denominator of the fraction on the right hand side to get,

This implies 


We multiply through by LCM of 


We expand to get,

We group like terms and equate everything to zero,

We split the middle term,

We factor to get,





But 

is not in the domain of the given equation.
It is an extraneous solution.

is the only solution.
QUESTION 2

We add x to both sides,

We square both sides,

We expand to get,

This implies,

We solve this quadratic equation by factorization,





But 

is an extraneous solution 
