River A and River B have a combined length of 650 miles and River B is 250 miles shorter than river A. How many miles long in river B?
Answers
A) 100  B) 200  C) 300  D) 400  E) not be determined
Total length of River A and River B is 650 miles.   Let X be the length of River A.   River B is 250 miles shorter than River A.   x+x-250=650   2x=650+250   x=450   Length of River A=450 miles.   Length of River 200=450-250= 
<gadget id="calculator">450-250</gadget>
<output>200</output>
200 miles   Answer is option 200
<result>B</result>
River A and River B have a combined length of 650 miles and River B is 250 miles shorter than river A. How many miles long in river B?