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In 8 year Mac's grandma will be twice as old as she was 29 years ago. How old will Mac's grandmother be in 4 years

 Jan 25, 2019
 #1
avatar+103917 
+1

In 8 years Mac's grandma will be twice as old as she was 29 years ago. How old will Mac's grandmother be in 4 years

 

 

Let her age now = A

 

29 years ago her age = A - 29

 

And in 8 years, her age will be A + 8

 

So...we know that

 

2 (A - 29) = A + 8         simplify

 

2A - 58 =  A + 8        add 58 to both sides, subtract A from both sides

 

A =  66       this is her age now

 

So....in 4 years, she will be   70

 

 

cool cool cool

 Jan 25, 2019
 #2
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+1

Let her age 29 years ago =A

 

A + 29 + 8 = 2A

A =37 - her age 29 years ago

37 + 29 + 8 - 4 =70 years 4 years from now.

 Jan 25, 2019

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