Daniel's age is
17 of his uncle's. His uncle will be 70 years old in 7 years' time. In how many years' time will Daniel's age be
25 of his uncle's?
|
Daniel |
His uncle |
Difference |
Before |
1 u |
7 u |
54 |
Change |
+ 7 |
+ 7 |
|
After |
|
70 |
|
His uncle's current age
= 70 - 7
= 63
7 u = 63
1 u = 63 ÷ 7 = 9
Daniel's current age = 9
The difference in the age between Daniel and his uncle remains the same.
Difference in the age between Daniel and his uncle
= 7 u - 1 u
= 6 u
= 6 x 9
= 54
|
Daniel |
His uncle |
Difference |
Before |
1 u |
7 u |
54 |
Change |
+ ? |
+ ? |
|
After |
2 p |
5 p |
3 p |
3 p = 54
1 p = 54 ÷ 3 = 18
Daniel's age when he will be
25 of his uncle's age
= 2 p
= 2 x 18
= 36
Number of years' time when Daniel's age will be
25 of his uncle's age
= 2 p - 1 u
= 36 - 18
= 18
Answer(s): 18