When Mr Cody is 41 years old, his daughter is 7 years old. In how many years will he be 3 times as old as his daughter?
| |
Mr Cody |
His daughter |
Difference |
| Before |
41 |
7 |
34 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mr Cody and his daughter at first and in the end remains the same.
Difference in the age between Mr Cody and his daughter
= 3 u - 1 u
= 2 u
2 u = 41 - 7
2 u = 34
1 u = 34 ÷ 2 = 17
Number of years' time so Mr Cody will be 3 times as old as his daughter
= 17 - 7
= 10
Answer(s): 10
