Tim's age is
25 his sister's age now. In 25 years' time, his age will be
35 that of his sister's. How old is Tim now?
| |
Tim |
Tim's sister |
Difference |
| Before |
2x2 =
4 u |
5x2 =
10 u |
3x2 =
6 u |
| Change |
+ 25 |
+ 25 |
|
| After |
3x3 =
9 u |
5x3 =
15 u |
2x3 =
6 u |
The difference in the age between Tim and Tim's sister remains unchanged. Make the difference in age the same. LCM of 3 and 2 is 6.
Increase in the age of Tim
= 9 u - 4 u
= 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Tim's age now
= 4 u
= 4 x 5
= 20
Answer(s): 20
