Cody is 7 years old. His father is 28 years older than him. In how many years will Cody's father be 3 times as old as Cody?
| |
His father |
Cody |
Difference |
| Before |
35 |
7 |
28 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Cody and his father at first and in the end remains the same.
Difference in the age between Cody and his father
= 3 u - 1 u
= 2 u
2 u = 28
1 u = 28 ÷ 2 = 14
The increase in age of Cody and his father remains the same.
Number of years' time so Cody's father will be 3 times as old as Cody
= 14 - 7
= 7
Answer(s): 7
