Gwen is 4 years old. Her uncle is 38 years old. How old will Gwen be when her uncle is three times her age?
| |
Gwen |
Her uncle |
Difference |
| Before |
4 |
38 |
34 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
3 u |
2 u |
The difference in the age between Gwen and her uncle remains unchanged.
Difference in their age at first
= 38 - 4
= 34
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 34
1 u = 34 ÷ 2 = 17
Gwen's age when her uncle is three times her age
= 1 u
= 17
Answer(s): 17
