Question 398908
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Hi, 
Bobby weighs 160 lbs more than his sister maria
Let x and (160 + x) represent maria's and bobby's weights  respectively
Question states***
 x  + (160 + x) = 200lb
Solving for x
 2x + 160 = 200lb
       2x = 40lb
        x = 20lb, Maria's weight.  Bobby weighs  180lb.   (160 + 20)
 
CHECKING our Answer***
 20lb + 180lb = 200lb