We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
280
2
avatar

Five years ago, Tim’s mom was three times Tim’s age today. Now their combined ages are 45. How old is Tim’s mom today?

 Nov 30, 2018
 #1
avatar+18439 
+1

x = mom age now    t = Tims age now

 

(x-5) = 3(t)

and

x + t =45

   t = 45-x     sub this in to the first equation

 

(x-5) = 3(45-x)

x-5 = 135 - 3x

4x = 140

x = 35= Mom's age now

 Nov 30, 2018
 #2
avatar+101796 
+1

Let Tim's age today  = x

Five years ago his mom's age was 3x

So....her age now is  3x+ 5

 

So

 

3x+ 5 + x  = 45

4x + 5 = 45

4x = 40

x = 10

 

And her age now is   3(10)+ 5  =  35

 

cool cool cool

 Dec 1, 2018

8 Online Users

avatar