Yen is 5 years old. Her mother is 31 years old. How old will Yen be when her mother is three times her age?
| |
Yen |
Her mother |
Difference |
| Before |
5 |
31 |
26 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
3 u |
2 u |
The difference in the age between Yen and her mother remains unchanged.
Difference in their age at first
= 31 - 5
= 26
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 26
1 u = 26 ÷ 2 = 13
Yen's age when her mother is three times her age
= 1 u
= 13
Answer(s): 13
