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I think its B. Please check my answer. Thanks!

 Feb 4, 2019
 #1
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School A   1v + 10b = 300

School B    4v + 5b = 185     Multiply second equation by -2 and add to equation 1 to get

 

              -7v = -70

                  v = 10

 

Sustitute this value in for v in either one of the equations to find b

 

10 + 10b = 300

10 b = 290

b = 29

 Feb 4, 2019

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