Daniel's age is
18 of his uncle's. His uncle will be 57 years old in 9 years' time. In how many years' time will Daniel's age be
25 of his uncle's?
|
Daniel |
His uncle |
Difference |
Before |
1 u |
8 u |
42 |
Change |
+ 9 |
+ 9 |
|
After |
|
57 |
|
His uncle's current age
= 57 - 9
= 48
8 u = 48
1 u = 48 ÷ 8 = 6
Daniel's current age = 6
The difference in the age between Daniel and his uncle remains the same.
Difference in the age between Daniel and his uncle
= 8 u - 1 u
= 7 u
= 7 x 6
= 42
|
Daniel |
His uncle |
Difference |
Before |
1 u |
8 u |
42 |
Change |
+ ? |
+ ? |
|
After |
2 p |
5 p |
3 p |
3 p = 42
1 p = 42 ÷ 3 = 14
Daniel's age when he will be
25 of his uncle's age
= 2 p
= 2 x 14
= 28
Number of years' time when Daniel's age will be
25 of his uncle's age
= 2 p - 1 u
= 28 - 14
= 14
Answer(s): 14