+0  
 
0
74
1
avatar+803 

Given that \(\frac{a}{25-a}+\frac{b}{65-b}+\frac{c}{60-c}=7\), evaluate \(\frac{5}{25-a}+\frac{13}{65-b}+\frac{12}{60-c}\).

Lightning  Sep 6, 2018
 #1
avatar+27153 
+1

Notice that 25 = 5*5,  65 = 13*5,  60 = 12*5.  One simple way is then as follows:

 

 

Other choices are possible for a, b and c, but they all lead to the same final result.

Alan  Sep 7, 2018

33 Online Users

avatar
avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.