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 

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