Daniel's age is
110 of his uncle's. His uncle will be 42 years old in 2 years' time. In how many years' time will Daniel's age be
25 of his uncle's?
|
Daniel |
His uncle |
Difference |
Before |
1 u |
10 u |
36 |
Change |
+ 2 |
+ 2 |
|
After |
|
42 |
|
His uncle's current age
= 42 - 2
= 40
10 u = 40
1 u = 40 ÷ 10 = 4
Daniel's current age = 4
The difference in the age between Daniel and his uncle remains the same.
Difference in the age between Daniel and his uncle
= 10 u - 1 u
= 9 u
= 9 x 4
= 36
|
Daniel |
His uncle |
Difference |
Before |
1 u |
10 u |
36 |
Change |
+ ? |
+ ? |
|
After |
2 p |
5 p |
3 p |
3 p = 36
1 p = 36 ÷ 3 = 12
Daniel's age when he will be
25 of his uncle's age
= 2 p
= 2 x 12
= 24
Number of years' time when Daniel's age will be
25 of his uncle's age
= 2 p - 1 u
= 24 - 12
= 12
Answer(s): 12