+0  
 
0
160
1
avatar+121 

Solve for x. 

AgentFatboy  Apr 10, 2018
 #1
avatar+92367 
+2

We have the following ratio

 

25 / 15  = [7x - 40 ] / 18     cross-multiply

 

18 * 25  =    15 * [ 7x - 40]     simplify

 

450  =  105x - 600     add  600 to both sides

 

1050  = 105x       divide both sides by 105

 

10  = x

 

 

cool cool cool

CPhill  Apr 10, 2018

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