SOLUTION: Mr. Klinker is 35 and his daughter is 10. In how many years will Mr. Klinker be twice as old as his daughter? What mathematical concept is this and how do you set it up, please

Question 728206: Mr. Klinker is 35 and his daughter is 10. In how many years will Mr. Klinker be twice as old as his daughter?
What mathematical concept is this and how do you set it up, please?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Mr. Klinker is 35 and his daughter is 10. In how many years will Mr. Klinker be twice as old as his daughter?
What mathematical concept is this and how do you set it up, please?
----------------
The difference in age is, and always will be, 25 years.
If he's 2x her age, --> 50 & 25.
=====================================
The hard way:
k = his age
d = her age
---
35 + x = (10 + x)*2
35 + x = 20 + 2x
x = 15
--> in 15 years
same answer

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