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https://snag.gy/lOd3Cw.jpg

 Sep 19, 2018
 #1
avatar+101872 
+1

 

Let her sister's age  = x  and let Kim's age  = 4x

 

So  (a)  is

 

x + 4x  = 60    simplify

 

5x  = 60    divide both sides by 5

 

x  = 12

 

(b)

 

Her sister is 12 years old and Kim  is  4(12)  =  48 years old

 

cool cool cool

 Sep 19, 2018

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