Usha is 5 years old. Her mother is 29 years old. How old will Usha be when her mother is three times her age?
| |
Usha |
Her mother |
Difference |
| Before |
5 |
29 |
24 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
3 u |
2 u |
The difference in the age between Usha and her mother remains unchanged.
Difference in their age at first
= 29 - 5
= 24
Difference in their age in the end
= 3 u - 1 u
= 2 u
2 u = 24
1 u = 24 ÷ 2 = 12
Usha's age when her mother is three times her age
= 1 u
= 12
Answer(s): 12
