Vaidev is 5 years old now. His sister is 15 years older than him. How old will Vaidev be when his age is
49 of his sister's age?
| |
Vaidev |
His sister |
Difference |
| Before |
|
|
15 |
| Change |
+ ? |
+ ? |
|
| After |
4 u |
9 u |
5 u |
The difference in the age between Vaidev and his sister at first and in the end remains unchanged.
Number of years that his sister is older than Vaidev
= 9 u - 4 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Vaidev's age when his age is
49 of his sister's age
= 4 u
= 4 x 3
= 12
Answer(s): 12
