Quantcast XP Math - Forums - View Single Post - Problem on ages
Thread: Problem on ages
View Single Post
Old 07-10-2014   #3
MAS1

 
Join Date: Dec 2008
Posts: 249
Default

Quote:
Originally Posted by burgess View Post
Help me to solve my algebra 1 homework on ages

The difference between the ages of two persons is 10 years. Fifteen years ago, the elder one was twice as old as the younger one. What is the present age of younger one?

Thanks
x = present age of elder person
y = present age of younger person

x - y = 10

(x - 15) = 2(y - 15)

x = 10 + y

(10 + y - 15) = 2(y - 15)
y - 5 = 2y - 30
-5 = y - 30
30 - 5 = y
25 = y

So the younger person is 25 and the older person is 35.
MAS1 is offline