a+b+c=68
b-3=a
c-5=b
now just solve the system of equations, substitue so that there are only b's in the equation:
a+b+c=68
(b-3) + b + (b+5) = 68
3b=66
b=22
Therefore Barbara is 22
 
        
             
        
        
        
Answer:
What do you need us to solve?
Step-by-step explanation:
 
        
             
        
        
        
Answer:
24
Step-by-step explanation:
96 divided by 4 = 24
 
        
                    
             
        
        
        
Answer:
2 positive * 1 negative = negative
2 negative * 1 positive = positive
Step-by-step explanation:
one positive and 2 negative
(+ * -) * - =
positive times negative = negative * negative = positive 
(+ * -) * -  = +
now if we change the order by putting parenthesis
+ *( - * -)
negative time negative = positive
+ * (+) = positive
the result is positive 
The result does not change because of where we put the parentheses.
- * + * + =
negative  times positive = negative
negative * positive= negative
- * + * + =  negative
The order does not matter