March 5, 2015

Homework Help: Math

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

FIve years ago Zack would have been three times older than his young brother but five years from now he will only be two times older than his brother. How old is his brother?


In other words let x= brothers age so:

Then 3x-15=2x+10

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.

Answer this Question

First Name:
School Subject:

Related Questions

math - A. Brad is 12 years older than Sam . If Brad were 8 years older than he ...
math - A. John is now 10 years older than Marcus. Three times John's age 5 years...
algebra - A person is 3 times as old as aonther person but in 15 years she will ...
math - you are 6 years older than your sister she is 4 years older than your ...
math - Joan is 'y' years old. Her father is 4 times as old as she is and 28 ...
Math - Luis is 10 years older than his brother. Next year, he will be three ...
algebra - Ten years from now Tim will be twice as old as Jane was when mary was ...
Calculus - On Dick's birthday, his brother Harry is seventeen years younger than...
Math - In five years,Emma will be three years more than twice as old as her son...
Math - Jason is 20 years old. He is 4 times older than his younger brother. ...