When Mr Vaidev is 47 years old, his daughter is 7 years old. In how many years will he be 5 times as old as his daughter?
| |
Mr Vaidev |
His daughter |
Difference |
| Before |
47 |
7 |
40 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the age between Mr Vaidev and his daughter at first and in the end remains the same.
Difference in the age between Mr Vaidev and his daughter
= 5 u - 1 u
= 4 u
4 u = 47 - 7
4 u = 40
1 u = 40 ÷ 4 = 10
Number of years' time so Mr Vaidev will be 5 times as old as his daughter
= 10 - 7
= 3
Answer(s): 3
