SOLUTION: John is 9 times Derek's age. If the difference in their age is 16, how old is Derek?

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Question 584974: John is 9 times Derek's age. If the difference in their age is 16, how old is Derek?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Just write an equation for each statement:
;
John is 9 times Derek's age.
j = 9d
;
If the difference in their age is 16,
j - d = 16
:
how old is Derek?
replace j with 9d
9d - d = 16
8d = 16
d = 16/8
d = 2 is Derek's age