Fanny is 3 years old. Her father is 37 years old. How old will Fanny be when her father is three times her age?
| |
Fanny |
Her father |
Difference |
| Before |
3 |
37 |
34 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
3 u |
2 u |
The difference in the age between Fanny and her father remains unchanged.
Difference in their age at first
= 37 - 3
= 34
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 34
1 u = 34 ÷ 2 = 17
Fanny's age when her father is three times her age
= 1 u
= 17
Answer(s): 17
