+0  
 
0
39
1
avatar

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

 Feb 4, 2019
 #1
avatar+17331 
+2

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

15 Online Users

avatar
avatar
avatar
avatar