+0  
 
0
117
2
avatar+32 

           

 Nov 7, 2018
 #1
avatar+98044 
+1

r / 5  = 4/ 7

 

cross-multiply

 

7 * r  =  4* 5 

 

7 * r   = 20   

 

divide both sides by 7

 

r  =  20 / 7

 

 

cool cool cool

 Nov 7, 2018
 #2
avatar+17209 
+1

r /5 = 4/7   Multiply both sides by 5

 

5 (r/5) = 4/7 *5

r = 20/7

 Nov 7, 2018

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