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March 28, 2015

March 28, 2015

Posted by **Oscar** on Tuesday, September 26, 2006 at 9:08pm.

25

In other words let x= brothers age so:

3(x-5)=2(x+5)

Then 3x-15=2x+10

x=25

I thought it might help to see the process. Five years ago, his age would be X-5. Five years from now, it will be X+5. Can you see how we develop the formula below?

3(X-5) = 2(X+5)

Just multiply and solve for X.

I hope this helps a little more. Thanks for asking.

Did anyone even see that the question wanted his brother's age. Also, how did you test your answers?

Let y be Zack's age and x his brother's age. We're told

y-5=3(x-5)=3x-15 so y=3x-10

y+5=2(x+5)=2x+10 so y=2x+5

equating them

3x-10=2x+5, and solving for x we find his brother is 15 and Zack is 35.

Test: 5yrs ago Zack was 30 and his brother was 10. 5yrs from now Zack is 40 and his brother is 20.

- Math -
**j.hargrove**, Wednesday, November 4, 2009 at 7:12pmy=3x-10

y=2x-5

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