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 Nov 7, 2018
 #1
avatar+102390 
+2

OK....not as tough as it appears

 

4 / r  =  5 /7    cross-multiply

 

4 * 7  =  5 * r      

 

28 = 5*r   divide both sides by 5

 

28 / 5  =  r     [ and we are through  !!! ]

 

 

cool cool cool

 Nov 7, 2018

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